mine tend to be slightly rich in midrange when i first start them but after few strafing runs (say a couple minutes in the air) the engine comes up to temperature and they are fine. this is affected at the low end of midrange somewhat by the idle setting.

on the other hand i don't fly extended periods at half throttle because i like full speed in my warbirds. i would expect that it would not be too hard to set the carb for whatever speed you would tend to fly. the biggest thing is to get the engine broken in before you try to set the carb too closely, as with this engine the idle settles down after they are broken in for an hour or two. until then you need to set the idle up some to keep them running.

good luck

ed