If your having symptoms during exertion i would guess like myself and other HCM patients your obstruction shows up the more stress you put on your heart!
My question to you would be are you being seen by a HCM specialist or at a COE center? During ykur echos are they having yku do a valsava movement or any type of body squats to see your gradient under stress?
While on camzyos my relaxed gradient was 10
And after doing about 15 body squats it would raise to 38

Hope this helps