CYA...how do you think it got that high? Are you using the pucks? I think if your supply water is "free" I would consider dumping about a 1/3 of the pool and refilling..but that is not "needed", as you can work with a CYA of 75 if you SYOP using the pucks and switch to clorox. You will want to find the shock value for your pool and get it there for a few days in order to get rid of the CC. I am guessing 12 is not high enough, and I am sure someone will be along soon to give you the numbers to shoot for. You also want to lower the alk...have you read the alk sticky? I would keep the PH down around 7 and aerate the pool for a week and I bet that will lower the alk.

all in all though the numbers look pretty decent...and these guys will be able to dial you in.