Regarding the bent shields - take them off and throw them away. Not needed.
Lube - use very little. With the shields off, hit the bearing with the compressed air to remove the excess. Or, don’t lube in the first place.
Cleaning - shields off, dry with compressed air.
Have you checked the videos here: Useful modification & maintenance guides -- clean, repair, tune, fix yoyos - #17 by yoyojoe