What I prefer after trying many methods, is to use the regular, non reduced EV bowl, with no pad or capsule. Set the unit to a good mid temp. say, between 190c and 195c. (I like 192c after some welcome guidance from @Vitolo ) Then you just put a tiny pinch in (or larger pinch, you'll get the feel) each time you blow a bag, and repeat over and over without emptying the chamber at all. You could stop and turn off the unit after any number of bags, and resume later. When the bowl is about over half full of light browned material, I grind that and put it back in covered by either liquid pad or cotton to prevent ABV dust blowing through the upper screen, and blow a final bag at 210c. You can keep the remains and re-vape at 223c-230c to your taste later, or put to other uses or discard. If your doing this, and also getting reclaim from your bags and chamber top, it's hard to imagine that you could vaporize any more efficiently with any device!