To me, 70# is 70#, period (80 is 80 etc.). In my opinion The reason people claim that a draw cycle feels less is primarily the transitions and how long at peak weight (aka smooth draw cycle). If I was shooting a 70# at 60#, I would not order 80#....don't care how smooth it is.
If you are shooting a 70# bow easily and feel like you have more in the tank, have a party...you can always shoot an 80# at 70. However, as previously stated, at a slight efficiency penalty.
Personally I order and shoot bows at max poundage. Bows are plenty fast these days and I don't need more than 65#. My elk arrows are over 500grains and still shoot over 280fps. I shoot a lot of arrows and require an "easy" draw cycle. I can shoot 70# no problem and probably do just fine with 80# with limited shooting (wouldn't want to shoot 100 arrows in 1 session). I have absolutely no reason to push my limits and call it my hunting bow...for me there is diminishing returns for a little more penetration. The old cliche is with a well placed shot, I will get a pass through...which is true for 90% of the animals I Hunt even with my 51# long bow. But many try to bow up for the less than perfect shots. To each his own.
I Hunt with what I practice, more accurate and steadier on the shot....easier to hold for extended periods. When you hunt, you don't get to warm up with a few arrows when it is time to shoot an animal. When it's cold and i am squatting, sitting, crounching, or in a stand, I have a lot more confidence with that 1 shot when it is an easy pull back. I am more likely to make that good shot and not need that slightly faster arrow for a less than perfect shot. I know, stuff happens and animals move, jump the string, or there is grass or brush that went under noticed between you and the animal and there would be added benefit of a faster arrow but for me, as stated it is a diminishing return for the added benefit.
Good luck.
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