Wow that was stupid ! Don't waist your time trying it. It just "kind" of works and ends clogging your glass tip when fiber gets a bit reclaim heavy. I was too vaped I thinkSo I put a little hemp fibre ball in the L joint to restrict the airflow differently.
Far better solution : hemp fiber flat disc in the bowl, flattened and heat-shaped against the screen. Guaranteed airflaw restriction heat jump without clogging. Even better, it's possible to have it as an option in just one bowl.