The refill is needed due to the CYA ... period. What makes you think you have elevated FC and TA?
Without posting a full set of results (even the dreaded pool store) it is hard to guess. It is also help to keep track of readings so you can see trends.
I would order the test kit. Then take a sample to a store and report the results. Then likely start replacing water.
@techguy ... currently only strips are being used for testing