If your pool is plaster/concrete/gunite, you need your calcium to be 200-400 ppm. If it's vinyl-lined, then you don't need to keep it that high. Usually with a vinyl liner, the lower, the better--but with your TA that high, keeping it low is a necessity to keep from getting milky water from precipitating calcium. Use muriatic or dry acid to lower your pH, which will also lower your TA (as outlined in the sticky), but read the guidelines for safe handling of muriatic acid linked in my sig below, first.

Edit: Looks like Watermom's post button works faster than mine today!