Wow, I hope that you still have some color left on your liner!!

I'll let Ben, Richard, or some of the other chemists address the effectiveness of the high pH, but just wanted to say that you can't trust your pH readings with your chlorine levels that high. Even with the better kits, the pH will read falsely high when the chlorine levels are as high as yours are.

The dichlor that you used is fine--it has a low pH, and will tend to drop the pH in your pool, but you just have to be careful to watch your CYA levels because it is stabilized and they will rise.