Hi. I've noticed that far too often (and perhaps with certain ingredients vs others tho I'm not sure) my juice/blast comes out too thick. It's a foamy, almost solid of foodstuff about 1-2 inches thick and the liquid, drinkable part is below. Advice on how to get a uniform, fluid, drinkable consistence? I can hardly choke this stuff down. Was thinking that maybe I'm running the machine too long or not long enough but cannot tell. Please advise. Thx.