I just put new vanes on the arrows, went from a 5" to a 4", these are made for this bow so I think they should be within Excalibur's specs.
Also, when I put on the new vanes I realized the nocks were plastic, so I had to put in aluminum just to get my Fletcher's adapter into them, so up went my weight again.. I think I am safe.
So far I have been pretty careful with the weights I am using, in most instances I have gone heavier than recommended, today I am trying to get close to the factory specs for my Exocet and gain some speed.
Good point about being too light, I will factor that in.. Thanks.