Agree with fatlander. Without knowing the specifics of your setup, what I would say is that it comes down to what flies best out of your bow. Brass/standard, three v four fletch, lighted nock v standard etc. The more you can test and see what groups best downrange is what you should go with. At your draw length, you should be getting great speeds regardless of what you shoot. I have a 29" draw, shoot a fuzz over 70lbs and use a 50gr brass insert because there was a noticeable difference (especially beyond 50 yards) in group size. The brass just shot better. It was worth the loss in speed (again for me) because I had an arrow that was tuned to my setup. The only time I changed my arrow setup to get more speed was hunting Axis deer in Hawaii. Those deer are on a completely different level. However, for my "western hunt" setup I am still shooting at 280fps and have an arrow that shoots well with really any broadhead screwed on.
Use reliable resources and find a setup that works best for you. The more you can test at this time of year, the more confident you will feel when September rolls around. Its a great time of year for you to be doing this. A lot of people wait until mid-august to start doing these arrow tests on their setups and are a mess when they hit the field in September.