You are moving right along. The entire process is rather variable/unpredictable, even at this point. It sounds like one to three more nights for FC to hold overnight at 15, then possibly a few more days after that before you could swim (assuming the water is warm enough). This evening after adding chlorine at least once, when you are testing the FC level also test the CC level. That will help tell us how things are going.
If you switch to evenings only, chlorine usage will slow down dramatically from here on.
If you switch to evenings only, chlorine usage will slow down dramatically from here on.