Ok I'm going nuts here...

My in ground pool is cloudy, I can barely see the bottom of the shallow
end of the pool (roughly 15 x 30). I have been maintaining it, keeping
the chlorine and pH levels in check, at least I think I am...

I have three test kits, two strip based tests and one solution/drop
based. The problem is the two strip based tests are consistent with
each other but give me completely opposite results from the
solution/drops based test. Usually the strips tell me my pH is too low
(~6) and the solutions tell me the pH is a bit high (~7.8+). Which one
do I go with??

Here's the kicker, I brought a sample of the water to my local pool
store (a fairly popular chain) and their results on that particular day
agreed with the solution based test. Problem is they said everything
was fine, coloring and pH levels were fine and the guy's best guess for
the cloudy water was to "shock" it was 40% algaecide. I have put the
40% algaecide in the pool, according to volume and instructions. No
improvement.

I vacuum it regularly. As of today, chlorine levels are fine and pH is
a bit high according to the solution test and too low according to the
strips. I decided to go with the solution result and added a pH-
product. I have added a clarifier product many times (in the form of
tablets that you drop in the skimmer), still to no result.

Really need help here, going absolutely nuts.