My thought would be to look at it like time in the gym: to start shooting the new bow every second day, giving 48 hours recovery time for the muscles. Listen to your body and watch your form. My last jump in weight was from 70 to 80lbs. It took two weeks to be shooting 100+ arrows a session, but it is workable if you use back tension, and don't over do it.
Maybe start on a blind bale at five yards, just drawing, anchoring, pausing and releasing, with no worry about accuracy to start. Mix it up by letting down the bow without shooting in a controlled, slow manner on every third draw cycle.
There is a balance because without strength, the form won't happen, but the good form trains the right muscle groups to interact and respond in the proper way encouraging strength building where you want it to happen...enjoy the journey.