I'd get heavier heads. i used the tubes, hated them, the screw in inserts are nice but can act as a internal footer. so be warry. heavy heads though, easy to change and easy to get.
right now i shoot gold tip velocity 300s. with standard inserts 300gr points and 1.5 inch aluminum footers they weigh right in at 635 grains.
you can get a standard and a heavy point test kit from 3 rivers. i suggest them both.
took some time but i was able to get my arrows flying from 20 yards the same with bare shaft, field points, broadheads, and bareshaft broadhead. Yes i know you are not suppose to shoot broadheads bare shaft. i had a 900 yard open field so i was sure it was not going to do a 180 and come back at me.