Since I had to go to the pool store to get DE powder anyway, I decided to bring a water sample and have it tested. Now I'm thoroughly confused. Some of their measurements don't match mine at all. They say their test equipment uses lasers so its accurate, which I thought was funny. I'm going to take what is leftover of the sample and retest when I have time later today, but here is what they got that didn't match mine at all.

FC = 5.13 (I tested it at 16 4 or 5 hours ago)
CC = 0.07 (I tested it at zero)
CYA = 10 (I tested it at 40 this past Saturday)

Here are the values that more or less match mine:
Ph=7.8 (I got 7.7 this morning)
TA=168 (I got 160 a week ago)
CH = 163 (I got 140 a week ago)

Their suggestion was that I should add a half gallon of muriatic acid to bring my Ph and TA down. They say high TA could cause the cloudiness in my water. Should I listen to them?

I'll report back after I test the same water sample as the store.