My hands and forearms have weakened over the years. Arthritis has creep in with age. Arthritis gloves and Voltaren help with the arthritis and strength training may help with the hands and forearms. Just continuing to struggle with the slides (as a form of exercise) will also help. Asking instructors is something that I have learned to do; an experienced instructor usually has a wealth of knowledge.
* Another option is to change the recoil spring. *
Most pistols will successfully cycle your favorite ammunition with a simple recoil spring change. I know these lighter springs are available for 1911-style recoil systems and I have them for 1911s, Sigs, and CZs. For captured recoil springs (like Glocks, CZ P10s, etc.) there are customizable captured recoil springs made by DPM Captured Recoil Springs. I have one of these for a Sig P320 XCarry. Other manufacturers make these and they are sold by many online retailers.