I guess I have built up a tolerance to "heavier" weights... Started out with heavier weights and have maintained over the years... I'm not much help in the weights you are talking about but everything is relevant...
I can't remember hunting with less then 57# at my draw, and most harvests have been in the mid 60# and above... But, recently I got myself a set of low 80# limbs for one of my bows, and I simply shoot them to become proficient with them...
Granted, I don't know your shot sequence... But, when I'm training with a heavier then normal setup I hold at anchor for 3-5 seconds then loose... After 10 or so shots if I'm wavering I go to a lighter bow and finish my session... Over the next few days to a week I'm usually right where I need to be to be hunting proficient with the heavier setup...
Although it had been several years since I've had a 80# plus setup, after the first day of shooting I felt I was hunting proficient with my new limbs... As I said, I don't know that I can be of much help here, but it never hurts to try and help...
Basically, shoot yourself into the heavier bow... If that takes a training program so be it... Nothing trains the muscles needed to shoot a bow then shooting a bow...