Looks like you're pretty well at the limit as for arrow weigh/lb. Do you have a brass nockset? Mine slowed me down 4fps vs a tied on nockset. Considering you're not trying to yank your sjoulders out of socket you might consider a custom string of BCY8125 or Brownell TS-1 with two less strands than recommended. This may gain you as much as 10fps. Often overlooked, because they cost a few dollars.