Do you grind your herb at all?? I think I'll try the whole chunk way, sounds very flavorful. Crumbling it down as it cooks sounds like a great idea!!!
If i want to or need to conserve material I will crumble down the load after about 5 hits and keep ripping away. The herb will really give some rips at this point still, but flavor is greatly diminished.
But material is plentiful for me so i honestly typically dump the load once the flavor is gone. I know there is still lots of actives in my duff chunks but it doesn't bother me.
If you have never tried a whole chunk with the RBT heater tech i highly recommend it. Even with moist material if possible. Flavor heaven IMO.
Edit. I use a good size chunk and stuff that screen full. Cram it in there. It works better than if you have a really small chunk without fully stuffing the bowl.