I am battling the same enemy and it is a pain in the reef!!! If you have trouble getting your Calcium up, I would strongly suggest testing your Magnesium. Mag is directly related to the ability of raising Cal levels.
NSW carries Mag at 1250ppm. My guess is your Mag will test out at 850. With proper dosing you should be able to reach 1400ppm giving you a bit of leeway.
