You can try using more chlorine, but you're going to have to keep it in the 8-10 ppm range at all times (that's for 100+ CYA), and even that may not be enough. It might help if you use some polyquat 60 as well. No guarantees, but I guess it's worth a try. You do need to stop using the tablets, though--they are raising your stabilizer even higher and soon the CYA will be too high to compensate for even with high chlorine--if you're not at that point already.

Janet