Cool Beans you may not want to hear it but hand position can make a big difference. I've acquired a foot stool and sometimes use it to elevate the neck of the guitar and sometimes just cross my left leg over my right.

Poppa, I can just tell you that fingerpicking my OM with it's 1 3/4"- 2 5/16" is much more comfortable for my left hand than fingerpicking my Dreadnought with a 1 11/16"-2 1/8" string spacing even though the necks have similar V profiles and the action is similar on both. I do have fairly large hands and that measly 1/16 makes a big difference to me. Whoda' thunk it?
And BTW if you want to hear some high speed fingerstyle bluegrass check out Wayne Henderson and Friends on Youtube and for Nashville style try Scottie Anderson who is well represented on YT.vl