As FC increases, does muriatic acid need decrease?

Hi.
Seems like my muriatic acid requirements have lessened by 75% after raising chlorine maintenance level to 7. CYA is 60.
Does this make sense?
TA- 70
PH - 7.4
FC- 6.8
CC 0.2
CH - 200
CYA - 60
TEMP - 82