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Ben, I have a HI2C pool, not by design,but by circumstances. Draining half the pool to lower CYA is not appealing. You mention "adjustments to testing techniques". Can you explain these adjustments? Taylor K2006 results: FC=18.0 CYA=70. (I have stopped using trichlor). I'm tracking down a leak that I'm, pretty such is in my return line so I'm replacing about 1 inch per day anyway when it doesn't rain (which is seldom this time of year).
You're not really in the HiC2 range, with a CYA=70. That is RECOMMENDED levels for an SWCG, and is an acceptable level generally.
The only real adjustment needed is to be use a Taylor pH test; using non-Taylor test with FC=18 can result in bogus readings as the phenol red indicator is converted to chlorophenol red, a DIFFERENT reagent.
Of course, at any level of CYA > 30 ppm, you need to follow the Best Guess chlorine levels, not the one in the Taylor book, or any other book.