Yours is actually a problem that we see frequently from people who have used trichlor (or dichlor) for a long time. The problem is that your chlorine is not high enough based on that CYA reading and since 100 is the highest the CYA test can read, it may actually be much higher than that. Take a look at the Best Guess Chlorine Chart in my signature below for the correlation between CYA and needed chlorine levels.
I'd suggest just using bleach for your chlorine. Your calcium hardness is getting kind of high and your CYA is way too high and the trichlor tabs will continue to add more CYA.
You definitely need a better kit that can test values past 5ppm. Order a Taylor K-2006 or 2006C (better buy) from the test kit link in my signature. You'll need it to operate this high CYA pool.
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