His_Highness
In the land of the blind, the one-eyed man is king
I have the opposite , maybe you need to send your Evo in and have your temps checked. At 12 I get anywhere from 4-7 hits , if I bump up to 3 I can extract all in about 2-3 hits. This is with a half full elbow or 75% full, try to not fill the elb all the way. The Evo seems to work better at 50-75% packed. Also dependent on draw speed , your material quality and the dryness of it. There is many things that can contribute to this , even your draw speed.
I'm with you Justpassed..... I get 6 hits at 1 o'clock from hardly more than a 1/4 ELB. Maybe @Simplicius is using a big ol' piece of glass with a huge can and has an equally huge lung capacity?