I just got back from Leslie's to get my water tested (for a more definite # for CYA). They got a 117 which is pretty close to what I was getting. They recommended staying with the stabilized chlorine rather than switching to cal-hypo. They said the CYA would be fine and that I don't want to add more calcium to the pool.

Full test results:
FC 5.99
CH 275
CYA 117
TA 143
PH 7.9 (I just added 32oz muriatic acid)