I wasn't sure if I should make this a new question so I'll just stay on this thread.
I have been monitoring my pool chemistry almost every day since July 13 2014. Since that time I have added 12 lbs. of baking soda and 6.25 gal. of Muriatic Acid. All of my numbers are good:

FC 6.8
CC 0.0
pH 7.8
TA 90
CH 275
CYA 70

My question has to do with my pH. It is always high. As you can see I am continually adding acid. It just seems like a lot of acid. I am wondering if my pH is just normally high and if there is any thing to worry about with a high pH. My K2006 test kit only goes up to 8 so I am not sure how high my pH actually goes. Is there a different test kit that has a higher pH range? How high is too high? Do some pools naturally have a high pH? This is driving me nuts! Any advice is greatly appreciated. Thank you.