Loxicom might well affect kidney function if given long term, we were advised with Clover's leg that it was really up to us- long term daily pain relief or long term kidney damage. So glad she's fine without it. Definitely worth mentioning both the improvement without loxicom, and the potential diagnosis ideas, to the vet. Pet owners (awful term, but slaves might make a vet look st you weird!) usually know their pets best and a good vet should always take on board an informed owner's suggestions.
Good luck with all your piggy health things! X