brackshooter....
Many people misunderstand Hill's suitcase grip. If you look at his own grip and his pupils' including Schulz' grip you will see what I'm saying. When you pick up a suitcase, you are gripping more tightly with the bottom two fingers than the top fingers. This is of utmost importance and is the secret key to bend the bottom limb correctly so that upon release, the two limbs will work in unison. Most people think that the suitcase grip means the thumb is in line with the belly of the grip. Look at any picture or movie of Hill or his pupils and you will see that his thumb is always to the right of the belly of the grip. The peak of the grip is in the 'y' of the hand between the thumb and the first finger. With the hand in this position, you won't torque the handle because you could actually shoot with the fingers open. Gripping firmly with the bottom fingers is the key.....the top fingers just go along for the ride.
After you have the limbs bending correctly and the bow performing, look at your arrows. If you are a right handed shooter, right wing feathers can kick of the arrow shelf and give bad arrow flight. Try shooting with the cock feather in towards the sight window or use left wing feathers. Also, it helps most Hill style longbow shootes to shoot overspine arrows. I use 10# over. With your long draw, you should be well into the 80-90# spine. Remember that the stiffer the arrow is, the less deflection, so that the arrow deflection between 70 and 90# is much less than between 50 and 70#. When I shot 80+ # bows, I saw very little difference between 85# spine and 95# spine because the deflection variance is so small. I would bet that you could shoot 90# spine better than anything else you've tried. Also, if you keep the tip weight around 125 gr. you won't weaken the spine as much as if you are using 160 gr. heads.
hope this helps.