Funny you brought this up. At the end of last year I was hitting the ball pretty straight with a little bias to the draw side. After coming through the winter I was hitting it straight with a slight bias to the fade side and it sllowly turned in to a constant fade with a slice bias 
So I was trying to figure something out myself and not paying a hguy to do it and I re-read Ben Hogans 5 rules book and the position of my thumb really stuck out to me, so I tucked it in there and it helped quite a bit, got me back to straight/fade with some slicing.
To further it later in the book I realized I had stopped turning my lead foot out has heldped even more and now I'm hitting draws again.
In the bag:
Cleveland Hi-Bore, 9.5*, Aldila NV Stiff
TaylorMade R5 XL, 4-9 Irons, reg. steel
Mizzuno MP.001 3W, Aldila NV
Nickent 3DX DC Hybrid 4/23*, stiff
T.P. Mills Tour Series 15 (circa mid-70's)
Adams 'Tom Watson' SW56-13, GW 52*, LW 60*
Ogio Nitrous
Callaway Warbird
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