I have been going up in weight as I get stronger.
Presently shoot 65lbs and next bow will be 70.
I use Rick Welch's formula to determine draw weight.
Rick says, you should be able to hold your draw weight at full draw for 3 to 4 seconds each shot or you're overbowed.
It's a formula I have used since I bought Rick's Volume 2 Instructional Video and learned of it.
Might not work for all but works just fine for me.
Sag.