OK,
pH of 7.2 is a little low but not so low you need to worry. In fact, chlorine will be more effective there. I'd leave it for now.

Yes, keep your FC at 20--check it two to three times a day, vacuum everyday, preferably to waste, and brush it everyday. If you have an robotic cleaner like a Dolphin or Aquabot that climbs and brushes the walls, you can use that to vacuum and brush.

Otherwise your plan is fine.

When you "get there", if pH is still at 7.2, try raising your pH by aerating the water rather than adding Borax as your T/A at 160 is a little high (but still OK for vinyl) and will otherwise go up even more as pH rises. Only raising pH by aeration will prevent that.

Aerating can be just by leaving the pool uncovered, adding a sprayer or fountain, or a gang of splashing kids--but the last is ONLY after the water is sanitary again.