Hey Darren, congrats on having water warm enough to swim in

According to the best guess chart, you should shock at 15-20 ppm FC for your CYA level of 60-65. Keeping the level there for a few days should clear things right up.

You can use the bleach calc to figure out how much Borax to add. A good tip is to add 1/2 of what it calls for, wait 24 hours, and test again. Better to go slow than overshoot.

I don't know of a good reason not to add borax at anytime to get your pH where you want it. Perhaps someone else has a good reason?