I assume CA = CYA?
If so, I'd drain and refill first and THEN add CYA. Doing the other way round will waste a lot of cyanuric acid.
If you can, I'd try to run a FAS-DPD test on your chlorine levels. When you lose a lot of CYA over the winter, there's a strong possibility that a lot of it ended up in your pool as ammonia, left over from the bacterial break-down of CYA. If this is the case, it will show up as low FC but high TC levels after dosing with chlorine. If you find out that this is your situation, I would NOT recommend adding CYA *or* operating your SWCG until you've got your pool cleaned up and ready to go.
But, with respect to all your other readings, I wouldn't worry about anything other than chlorine, pH and CYA until you've gotten your pool fully ready and clear.
Good luck!
Ben
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