Did you form an opinion on prep and packing method? "Asking for a friend" ?
This may sound weird, but I had very good experiences with cube cutting and then heavily squashing those cubes with a heavy, dull object, so that they get flat and break up a little more. These flattened cubes then were dried to bonedryness.
Another successful smoke was achieved by running the flakes through a food processor for a view seconds + drying.
Both of the times, the tobaccos was very very dry and packed extremely loose.
I hope this may help your friend out a little.