Re: apply the correct twist to the bow handle
Pressure at the bottom of the handle? In, my experience with SMG bows, they like pressure on the top of the handle, and the forward rotation. My first bow has frustrated me for one year until I discovered that it likes that. It is a lot more accurate when I do the forward rotation and likes to remind me if I don't do it . The other bows are not that sensitive, but with forward rotation they shoot better. You'll have to find the balance point of you bow.
I do the forward rotation only be wrist tension, by keeping the wrist as level (or straight) as possible. This increases the draw length a bit and puts more force on the top limb. It also prevents the arrow nock from hitting your thumb, so you can get away with a lower nock position.
Regarding relaxing the bow hand, I would not recommend it. First, the grip is not designed for that. Look at compound and recurve bow grips - they are designed for a relaxed grip, but in order to be relaxed, it has to be straight. Then, if you decide to relax the bow hand, then you would have to match the arrow spine more carefully.
Remember the teachings from Saracen Archery: "strong in both fists". I would say the bow hand is even more important than the draw hand. Never allow your bow to overpower your bow hand, because then you will be inaccurate. You are shooting the bow, not just drawing it.