Dan, One thing you wanna remember is 60# is 60# and 70# is 70#. Sure on a bow putting out a little more speed you may have to pull the poundage a little quicker and pull a little longer but it is still only what the scale says it is.
I will be Hunting with a 60# Bow this year that is producing over 70# KE. To me that is amazing from what was possible only a few short years ago. I intend to use it to it's full advantage.
The last thing I consider in a Bow purchase is what the draw feels like, as long as the valley feels good to me.Anything different is going to feel weird. The Draw cycle is something your body accustoms itself to really quick. As long as you are not over Bowed on poundage
I know you know all this, just a reminder
Dan