My latest slice of R9 (gold) brick (100gm 450bht) is consistent all the way through.
No dirt or seeds, not any more stem than my home grow.
As for bud size ........ does it really matter?
I've found the bigger the bud, the more stem you need to remove.
All I care about is THC content, and quite frankly I can't tell THC content by appearance, smelliness, stickiness, seed content or bud size, I have to smoke it to judge it.