I read an article recently (wish I could find it) regarding techniques for racking the slide. Suggested that if you are having difficulty, to try putting your hand over the slide, with your palm across the top. Get a good grip, then push the pistol forward, instead of trying to pull the slide back. Also try turning the pistol 90°, so the sites are on the left side instead of the top. That may feel more natural.
Another thing, as mentioned, is low recoil ammo. But you need to be sure it will cycle the slide.
I'll try to find the article. It was well done.