Thanks guys. I'm not necessarily looking to get as much speed out of it as possible, at least not at the expense of accuracy. My bow seems to shoot a 340 arrow and higher brace height better. I have 400 arrows they shoot at about 170 fps with the buttons and silencers on. Oh and I re-weighed the arrows and they are 513 grains.
I haven't practiced with the lighter limbs for quite a while. I think I will put the 50 lbs limbs on and head to the range and work on form for a week or so without keeping score...