The Cline regulator is also a common cure for this. The pattern guys use them sometimes when the tanks are mounted on the CG. the way they work is the engine is set up using case pressure (very strong) and then the regulator maintains a consistent diminished amount to provide a good constant mixture. I have never heard anything bad about them. they are a little expensive though.
Here is the link
http://www.billsroom.com/pcfs/
Personally I never had luck with the Perry pumps.