Want some more vertical? Try an APC 11/3 or 11/4 on yours. I was running mine on an os32/macs pipe combo with everything from a 9.5/6 APC (little red blur across the sky) to a 10/5 APC and then onto an 11/4 or 11/3 combo. It really slows the plane down at idle, and the vertical is phenominal.

Have you ever seen a better tumbling plane? You might want to add some wires to the tail to stiffen it up some, given the loading on it.

Good Luck with it

Steve