Greg,
Did you run a line from the diaphram into the fuse like the picture of mine? You may need to to help the burbling.
Also I have a 3.5" spinner on mine. If you don't need any nose weight I have a "carbon fiber like" 3.5" spinner cut for a xoar 22-8 that I will make you a real deal on. If you look on Valley View RC you can see them. If you want aluminum look at TBM
http://www.troybuiltmodels.com/ns/acce/spinners/mpial/. Only $28. I have this one and it is really nice. Also lighter than True Turn.
Is anyone from your club going to Franks this weekend?