Okay I'll back off cal mag I'm using ph perfect advance Nutes.Your at 50% recommended dosage. You can increase to 75%. Pro Mix is easy to flush with weaker nutes if your plant starts to burn. That's up to you.
Read up on Dolomite limestone they use as a pH buffer. It also starts releasing calcium around 4 to 6 weeks (dependent on water schedule). To prevent a possible lock out. I would stop or reduce using cal/mag.