HH rosin carts don't produce smoke, keep getting stuck halfway through

I made the switch from distillate carts to rosin based on the advice of this sub but out of 3 HHC rosin carts, 2 have clogged so far halfway through and won't produce any smoke. They don't even feel like they're hitting despite fine airflow. Am I missing something? Hitting on low temp, gentle and short pulls. Super disappointed.