We really don't trust any strips or strip readers. A Taylor K-2006 (or K-2006C) will give you the freedom to control your pool.

I'm going to guess that the pool's Calcium Hardness is a bit high and that with the pH on the high side of normal range you're seeing calcium precipitate - especially around the waterfall where the pH is even higher due to areation.

1) Get a K-2006 and measure pH, FC, CC, CYA, CH, TA

If pH and TA are confirmed and my suspicion about high CH is true:
a) Try to keep the pH around 7.2-7.4
b) Reduce the TA to 60-70