Without an exact pool volume, it's hard to calculate the exact amount of CYA in the water, but two pucks should not raise it that far. I think the major problem here is the Baquacil CDX algaecide. Experience on this forum has shown that when CDX is present, the conversion can take quite a bit longer. You seem to have pretty clear water and it looks like you're still fighting the Baquacil a bit. The best course of action is to maintain the 15ppm FC as best you can until the CC's subside. Maintenance is the key as letting the FC level drop below 15ppm only slows the process which is already hampered by the presence of CYA and the CDX algaecide. At this point, I would stay-the-course and continue with the conversion.
If you really feel like this is only going to go on forever, then the only other option is to drain the pool and start over. However, draining a pool is alway fraught with difficulty as you must ensure that the ground water levels is below the pool shell or else you can float the pool out of the ground. Also, with fiberglass pools, you typically need to brace the upper edges of the pool with cross beams to keep the pool shell from flexing inward since the shell relies on the water pressure to hold it against the ground. The manufacturer of the fiberglass shell should have instructions for how to brace the pool properly when it's drained.