I get it, moving platforms are super hard. Once I had them in a game but couldn't get them to work right so I just delete them and replace them with conveyer belts. Dunno if I've ever made them work right.
I think the real appeal of the hands, to me at least, is that when they first appear that's a real WTF moment, y'know, it's memorable. you're expecting normal human stuff and spooky supernatural hands appear out o nowhere. I think it's worth keeping that but lowering the annoyance of getting grabbed so often. for that reason a quick solution might have been something like, if you struggle and escape them, then the hands go away and leave you alone for a while.