Jerry:
I'll add keeping the stylus clean to your list.
I've been using the original Magic Eraser for years now, but my arm has an up/down lever (don't think I would try it manually).
Before that I was using a travel sized ultrasonic toothbrush with replaceable batteries (just touched the stylus with it) and a stylus brush - the Magic Eraser works just as well.
A dirty stylus and/or groove wear on LP's is a common cause of what the OP describes.
Grisly:
What cartridge do you have (see a few options supplied by Rega with the deck)?
The light/rigid approach is geared towards draining vibration off/away from the Rega (not isolating it).
This approach also works with my sprung/suspended TT as well as the CD deck.
Instead of buying one of the expensive recommended light/rigid racks I purchased a bolt together steel rack and mig-welded it into a one piece "rigid" unit.
I also ended up with zero fill in the hollow legs after experimenting, but the rack is located outside of the living/listening room.
DeKay