Cornell & Diehl tobaccos have sometimes been a little controversial among tobacco tasters due to their dryness. Craig Tarler sells his regular blends in bulk and they're an excellent value for the money, but I occasionally hear of bad impressions caused by differing humidity opinions. Craig ships his bulk tobacco very dry, almost crispy, but they are not neccessarily intended to be smoked that way. The tobacco is sold by the pound, and Craig's choice has been to not charge the customer for water weight. Moisture content can make up a significant percentage of the pound, and shipping dry tobacco gives the buyer more actual tobacco for the dollar while allowing them to moisturize it to their preferences. Obviously, this is not an approach for everyone. If a buyer insists on getting "ready to smoke" tobacco, he should stick to Craig's Premium Tinned Blends only and avoid the bulk tobaccos, IMO. Handling your own humidity control means the smoking experience can vary a great deal based on how much experimentation you're willing to do to find what moisture level is right for you and the blend. I enjoy this sort of freedom to tweak the tobacco, personally. Occasionally I'll get an email inquiring about a high C&D rating I've given, coming from a buyer who's in the midst of having a biting bowl from his crackling-dry, unmoisturized tobacco shipment. Just for the record, below is a list of what I do to my C&D bulk blends when they arrive. Let me stress very strongly that YOUR MILEAGE MAY VARY! This is by no means an absolute set of rules, and others may not need or desire to do any of this, or they may still just not like the blends once they've been tweaked.
Here's a pic of some bulk C&D spread out, with my normal implements of destruction arrayed around it.

• Chopping. I've found over the years that I seem to gravitate to thin-cut ribbon blends and flakes. I have no idea why my tastebuds like such opposing presentations of tobacco, but there you go. My personal puffing style doesn't seem to go well with broad-cut tobaccos, for whatever reason, and I have a hard time handling their burn characteristics. Craig seems to like a lot of broad cuts, though, and several of my favorite C&D blends flavor-wise are cut pretty big. I've found that a little work on the chopping block will render these a better smoke for me, though this is by no means an endorsement of this method or an indictment of the tobacco cut itself - it's strictly a personal thing. I'll spread out the bulk tobacco on a kitchen chopping board and carefully slice my way across it, breaking up the biggest bits with a good knife. I have to be careful not to cut it too small or it will burn much hotter for me, as I found out in early experiments with this wacky idea.
• Filtering. I don't like tobacco dust. For me, a lot of dust in a bowl burns like a firecracker, though I'd wager that some dust would be good for a new smoker who was having trouble keeping his bowls lit. In all the humidors I have, I habitually shake them to let the dust filter to the bottom, and periodically dump out the little bits once I've smoked down through the container. The C&D bulk blends contain some dust particles that I normally remove prior to humidifying the tobacco, since the moisture will make it sticky initially and then it won't filter. I simply load up the tobacco into my wife's spaghetti strainer. (Wives love this sort of thing. In fact, I assure you that your wife will be SO happy to see you using her kitchen utensils this way that you probably shouldn't even bother to ask before doing it. When you're discovered, you'll be overwhelmed by her giddy jubilation. Trust me.) I sift and shake the strainer, rolling the tobacco over and over and letting the dust fall through into the trash. I lose some tobacco weight this way but I don't mind, as I'd rather have less tobacco that's a better smoke (to me, anyway - PLEASE keep in mind that YMMV).
• Moisturizing. I keep a spray bottle of distilled water for this. Don't use tap water or you'll get the taste of the minerals and flavors in tap water into your tobacco. When I first started doing this, I used tap and kept thinking afterward that all my newly-moisturized tobaccos had the same weird flavor undertones. Tap was the culprit. Obviously this can vary a lot based on what your local water supply is like. I spray a thin mist into the air over the spread tobacco and let it settle down into it, then mix and stir it with my fingers and spray again. I get it just to the point where it feels springy but doesn't stick together, then pop it into a humidor with a ceramic moisture disc and leave it for several days to evenly humidify. I poke at it occasionally during this time and may add moisture or leave the top off for drying if it seems wrong.
• Aging. C&D is a small business, and like most small businesses they don't have the space to warehouse the vast amounts of tobacco they sell for prolonged periods of time. I've found that a little age is good for every tobacco, not just C&D's. I typically let new tins sit for a couple of months before I open them, and since C&D bulk blends are shipped relatively "fresh", I often let them age for 6 months or more before smoking. The time period allows the flavors in the tobacco to better meld, and often produces a better smoke. Ordering your tobacco blends pressed may help accelerate this process, since the hard compression allows the flavors to mingle more closely.