Crow,
I select my arrows and then I will add weight with different weight tubes tillI get the most KE my bow will produce. I have been doing it this way for so many years it just seems like second nature. I just recently did this and would up with 3gr tubes to get the best KE my set up will produce. However with today's newer bows this probably isn't all that necessary but I still like aheavier arrow for hunting. I go light and fastwith my 3-D set up's though.....