when I smoke HH/ HF, I only use a windcover to "warm up the bowl" or to make the coals last longer at then end of a session.
I also make SUPER TINY HOLES, lots of them, but very tiny , usually use a stick pin or a push pin and make tons of holes.
If you feel it getting harsh, remove coals until it's not harsh, let it "cool down" or it will burn the bowl.
I also don't use conco's but use 2 pieces of exotica. Been smoking hh/hf since I started. I still like it