I guess everybody is different, so take from this what you can get out of it.
I shoot a 75lb Blackwidow longbow and have done so for years. Almost daily, I shoot 40-50 arrows with it, and usually shoot it very easily, and usually shoot it better than just average.
But,,,, about three-ish years ago a mate bought an 80lb Blackwidow recurve (and what a looker it was too) and gave me a go with it.
I thought this should be easy, I'll draw that, it's only another 5lbs, that's nothing.
Boy was I wrong, I simply could not get it back to full draw (I draw just a fuzz under 28") He could shoot it though, and he shot it well.
So, I think that day I found my limit of what draw weight I can shoot accurately and consistantly with, 75lb, NOT 80lb, even though it's only a mere 5lb heavier.
What I'm trying to offer here (I think
) is once you start getting up in draw weight (and 65lb is starting to get up there) maybe go for small increments, like 5lb if possible, and MASTER that weight before going up again.
But I'm guessing, like me, you will more than likely find a maximum weight you can master and shoot well with.
Good luck and have fun
Best
Lex