I only skimmed all the posts, so correct me if someone did, but i'm suprised nobody brough this up yet. everyone ive ever smoked with uses a combination.

First you stuff a big nug in the bottom being careful not to clog it. A screen or adeptly placed stem will also do the trick, but we dont usually have screens on hand, and nobody wants to accidentally smoke a stem (especially one big enough to fill a slide hole). then put some chunky hand broken stuff on that, and fill the rest of the bowl (usually at least half) with some fine ground stuff and/or kief. since the stuff on top is so fine it always cherries in 1 hit, then slows down a bit at the small nugs after everyone takes a huuuuge first rip.

Its all scientifically planned out