I should add that actually having 120-150 ppm Calcium Hardness (CH) can be helpful to prevent foaming. At any rate, you've already got more than enough CH.

If you lower your TA much below 80 (say down to 50), then you should use an additional pH buffer such as 50 ppm Borates (usually from boric acid). This is typically done when using the Dichlor-then-bleach method for disinfection.