I have a custom 53# reflex/deflex long bow. I hunt using the FMJ's. I use the 500 spine FMJ with the full HIT insert (don't cut the insert down) and a 125 gr. tip. The 500's have a 9.1 gr. per inch shaft weight. My total arrow weight, with insert, and head is about 480 gr. I use 4" feathers.
Now a weird observation. I used 4" parabolic feathers for years. Last year I had some new arrows made up for me. The person accidentally put on 4" shield feathers. I thought, what the heck and tried them. The arrows fly much better with the shields. Maybe it's just me or my bow, but it was a considerable difference in accuracy and a better flight path, especially past 20 yrds.