I think that the alk is still a bit high, and also if you have kids who use the pool, then with splashing and all it will raise the Ph. Are you still aerating, that will raise the Ph also. I have found that adding acid to my pool around once a week is necessary as the Ph does seem to rise a bit, although slowly. If I am not mistaken the Alk needs to be at the highest 120, but I could be wrong.