A proper grip for me with the Pronghorn, is the same as an R&D, or longbow; heel the bow with even pressure, and held with the bottom two fingers, the top two are loose. Gripping, or squeezing should be avoided as it causes tension in the forearm, and could result in torque or flinching. Tension is also a killer if your shooting moving or flying targets, because the movement is supposed to be fluid. The grip pressure is sufficient to hold the bow at release.
If you have ever have shot skeet, trap or birds with a shotgun, played golf, baseball or tennis then you know that tension in the arms, caused by a tight grip is not conducive to a fluid movement.
Upon release, the bow hand stays on target and the fingers, open and the hand stays at the face, moving slightly back.