Your CYA level is very high, which is presumably why you are having problems in the first place. You will probably have to raise FC up into the 30s or significantly reduce your CYA level.
How are you testing the CYA level? None of the CYA tests are particularly accurate above 100, so listing it as 151 is suspicious.
How are you testing the CYA level? None of the CYA tests are particularly accurate above 100, so listing it as 151 is suspicious.