If I may pass along some sage advice given to me years back by archers far more experienced than I:
If you don't keep the shoulder down, you can develop shoulder impingement, even without using a heavy bow. It is important that you fully engage the rhomboids between your shoulder blades to execute proper form. You hold with the rhomboids and not with your arms. In doing so, IT IS VERY IMPORTANT THAT YOU KEEP YOUR BOW SHOULDER DOWN AND BACK TO PREVENT LONG TERM SHOULDER INJURIES. If the bow is of such weight that your shoulder is forced up and is compressed while at full draw, it is collapsed and is not down and back into the socket. You are then on the fast track towards impingement and long term injuries.
With all that said, I'm of the opinion that it does little good to train with a bow weight beyond your ability to execute safe and proper form. Even when using a bow that you can properly handle, it is a bad idea to shoot to the point that you exhaust your strength so that your shoulder is collapsed. If you intend on increasing your weight, do so in small steps over a period of time. If you are now shooting XX weight with relative ease, next bow you may decide to go up a few pounds. I think it a very bad idea to jump a large chunk of weight at one time as you may very well reduce the number of years that you can shoot a bow if you live to get old.
Not trying to preach, but thought I'd share a few tidbits that has helped me to shoot stickbows over the past 45 years without injury. I am the apple that didn't fall far from my Grandfather's and Father's tree. They both preferred hunting bows in the 60-70 pound range, so I fell into the same and never changed. I think you should shoot whatever weight you prefer, just go wisely and slow.
Best