I don't really think increasing the brace will keep you from hitting your face.It would help if you were slapping your wrist.
You have plenty of draw length on a 66" bow. 30.5 won't be a problem.
You can call Dan or check his web site for suggested brace but I figure it is somewhere between 6.5-7.5 inches.You can vary it in that range to help tune it to your arrow or it might just like a certin brace better.The brace it likes will be where it has the least vibration after the shot.
