Decided to keep my 2009 Firehawk rather than sell it to buy a Mathews Z7. Dropping it off Friday for a tune-up. Also going to have the poundage turned down to 53lbs. Here is the question. By dropping down draw weight should I consider going to an 85 gr. broadhead/field tip from 100 gr.? Also, should I be looking at a lighter shaft? Currently using Beman 400s. Thanks.