The wisker biscuit will allow you to shoot perfect groups if tuned properly. You do not need to get rid of your ideal hunting rest to get good groups.

I' m curious as to how you know your arrows are properly spined? What did you do to prove that? Going by a chart does not work. There is an ideal poundage to set every bow at, to get the exact correct spine on a given arrow.

I wanted to add, you should check for fletching contact on your riser. Use some powder to see if there is it is interferring.