So I'm hoping for tips for shaving...

I've tried razors with all different amounts of blades, I've tried different liquids: shaving cream, shower gel, conditioner... they all do the job but no matter what I still get bumps, occasional ingrowns and rough patches where the hair isn't short enough.

I always wash and exfoliate beforehand, and moisturise after (usually with coconut oil).

I can always feel the hairs again after just a few hours too, is there anything I can do about this without getting IPL for example, because that's (too) expensive (for me right now).

Also...

How do you go about shaving your ass, back, etc? I can't hold the skin tight with the razor lubricant on it and I can't reach my back to get that done, so I might just do depilation cream there, I'm not sure.

Do you just run the razor across the skin for your ass, without worrying about holding the skin tight for a close shave?