arrow help
 

Can anyone please help I have a 02 or 03 Hoyt ultra Tec I bought it used I am shooting 55lbs now but turn it to 60 lbs for hunting.
Arrows 27”
ata 37"
brace 71/2"
draw length 29"
Point wt 100gr
Fletch 4”
Ata 37.5
Brace height is 7 ¼
Info on cam is h-e-rb bottom cam h-e-r-t on top cam it’s a cam ½
Rest is a trophy taker shaky hunter
I tried downloading pin weel software but it wont download. i have been shooting xx78 2114 and they are grouping good all are in the yellow on a standard target but a man at the range said my arrows are underspined and I could tighten my groups with a stiffer arrow can anyone run this set up and see what you come up with what size should i be shooting thanks if you can help mike

RE: arrow help
 

I would use a carbon arrow that is 400. They are stiffer and they do group good.