PRIME binds ammonia into ammonium, a less toxic form your bacteria can still eat. Honestly, you're just going through a mini cycle and it's not something to get too worried over. If you're using prime, you have no ammonia in the tank... any test you're using is a false positive reading the ammonium. Bumping the ph up from 6 to 7 is a huge jump for sensitive fish, and also makes your ammonia more toxic (ammonia in ph below 7 begins to be converted to ammonium as well, the lower the ph the higher the ratio converted to ammonium will be... flip side is it takes longer to cycle your tank, and nitrites are toxic at any ph, so watch for them... an old school trick is to add a bit of salt to treat nitrite toxicity, but you don't need to do this if you do the folllowing..), be careful of ph shock when screwing with your ph.
I would just do daily 50% water changes with a normal dose of prime. Also, prime will kill your safestart... you can try to cycle with safestart but you can't use prime at all and are pretty much banking on the safestart working, which it doesn't 100% of the time.