Heavy is good. Fast is good. Heavy & fast are GREAT!
How fast are they flying? I am going to guess about 150 fps. If you are shooting that set up and you like it, stick with it. That’s a devastating hunting set up. Might cause you some grief on the 3 D range on the longer targets though…
If you want to switch up for more speed, that bow will shoot the CE 150s and GT 500s just fine with 160 ish grains on the business end and save you 60 grains or so in finished arrow weight, giving you longer range and more consistent accuracy. Keep in mind CE has discontinued the Heritage series of shafting though. The GT 500s are more fragile and lighter but they will work.
Just sticking my nose in without all the details.