I would suggest focusing on the finger patterns and not what specific strings you’re playing.
It will be a lot less to remember.
So if you’re doing T, I, M, T, I, M, T, M for example (Forward Roll), whatever strings you play think of that as the same roll.
I also recommend keeping the left hand super simple if you’re working on some new right hand rolls.
Good luck and keep picking.
Best,
Mike