I find the fold and stuff is the best for Pete's UF, and I leave a little space at the bottom to give it a little room. dubinthedam on youtube shows it the best, just type in "dubinthedam flakes" in the search.
Also, it likes to burn down the middle alot, so just pull the flake away from the sides and give it a slight tamp to keep it even.
You picked a fine flake to start with. Let us know how you like it.