Reduced Camzyos dosage after first 4 weeks

Has anyone on Camzyos ever had their doctor reduce dosage because the thickening was going down too fast? I just started on Camzyos 4 weeks ago and went for my first echo after starting the medicine. I was started on 5mg, my result was that my septal hypertrophy had gone from 2.0 cm to 1.6 cm.
He reduced my dosage from 5 mg to 2.5mg.