Try a brace heigth of about 8-8.5" You can move it higher or lower by twisting the stirng. Try different heights until the bow shoots smoother, no hand shock, and is quietest.
You will know if the string nock position is correct if the arrow flys perfectly straight. If it kicks up and down, nock posiiton is too high or low. Move it about 1/8" at a time until arrow does not kick up and down. Most importantly is proper shaft spine. If shaft kicks from side to side, shaft is too stiff or too weak. For proper flight, especially with broadheads spine needs ot be as perfect as possible. One way to determine proper spine to to shoot a shaft with no feathers. For a right hand shooter the nock kicks left if the shaft is too weak, kicks right if shaft is too stiff. If too stiff, try a heavier point, If too weak, cut it shorter. Concerning FOC, do not worry about it if you shoot carbons. In my opinion, forget the peep site, learn to shoot instinctive. It is like throwing a ball or casting a fishing lure, do it a million times and you will get good at it. Braodhead weight somewhat depends on the stiffness of the shaft spine, heavier points will help weaken a stiff shaft. Good luck.