6500 Gal AGP Vinyl liner been set up for about a month (I used well water)

So, I'm still having some trouble getting my water levels right. I took another sample to the pool store yesterday and the guy says it's reading chlorine lock. Here are the numbers that I got.

FC .08
Combined C .76
Calcium 318

TA *OVER*
PH 7.6

I've been using a SWG (that I'm having to clean with vinegar about every 2 weeks becuase of calcium build up) and some bleach from time to time. I'm using a drop tester and the chlorine is coming up in the "acceptable" range on that color tester. The person at the PS said to put 3 lbs of non-chlorine shock in it?

I turned off the SWG for now until I talked to you guys.

I've been trying to get the TA down for a while now, but I guess I'm not doing it quite right. (I've been adding a little muratic acid (about a gallon in all, but I haven't been able to spend as much time as I need to with it.)

Anyway, I'm just looking for some advise. I'm not smart enough to figure this out on my own, so a nice step by step would be great. I can follow directions.