Over the years, I have gradually learned what causes bite, and what to do about it, at least for me. Virginias are high sugar tobaccos, frequently quite wet, and tend to bite. Dry them out a good bit, and most the bite is gone. Most aromatics, and OTCs are highly processed and cased and tend to bite. Not much I have found I can do with them, they just always bite, so I don't smoke them. Relatively pure burley is a very low sugar tobacco and does not bite, at least to me. African tobaccos, such as GH uses are grown in Nitrogen poor soil, and are low sugar so they tend to be non bitey.