So do all  of the other types of planes I am rated in but that is
   not the point I was trying to make:)

   Doug

   I looked at those Hoke valves and they are really nice but
   IMHO not what we need.

   Paul Lamar

Paul,
The way the motorcycles handle the major transition from idle to WOT is
to simply put 2 tapers on the needle. You can even go to Sudco (a carb
supplier) and get a book with the needle tapers in it. I'd suggest yoou
duplicate one of the dual tapers to get a good transition.
Bill Jepson

That is over kill since the needles don't move as a function
air intake. They only move when the pilot moves them.
In that case he can watch the EGT or the mixture monitor
to set the mixture just right for cruise. Harder to machine
two tapers. We want to keep it simple.