If your FC is 2, then your TC can't be 1 because FC + CC = TC. Always. Go ahead and bump your pH and alk up a bit. CYA of 100 will make your pool harder to maintain. I would keep doing the partial drain and refill cycle and try go get the cya to around 50. And, with that high cya, you better get some chlorine in there or you're gonna have a green pool! Have you had a look at the Best Guess CYA Chart?