MSM
Sounds like stack height is the issue. With a short stack you essentially have an open fire and the smoke hat goes with it. No draft to pull the heat under the pans and up the chimney. I used 4x3' sections screwed together with sheet metal screws into a single piece. I drilled 3 holes in the top piece 120 degrees apart and twisted about 5' of fence wire into each hole. I then attached bright ropes to the wires and extended them out to the ground. I tied each rope around a cinder block for an anchor. Works well, but be sure to put something in the way to block the path below them or you'll end up hanging yourself on them and pulling the smoke stack down.

I'd give that a try. Should improve things.