There won't be much difference in the Parker or Legacy if the brace height is close. Without knowing your arrow weight it's hard to give you any figures. With my Legacy at 29.5" & 64 lbs. I'm getting 285 through my chronograph with a 358 grain arrow. With your draw length you'll lose 18-22 feet per second, but you'll gain 12 feet going to 70 pounds. So now we're at 275 or so, for every 5 grains over 358 you'll lose another foot. You should be able to get 260 or close and still shoot a 435 grain arrow. Now before buying one it might be best to go shoot it through a chrono, just to see if I'm close.