Hello,
Here is a solution which hasn't been offered. Order a twister heatdam (manifold) from Homelite. Part number PS04357. This will give you a streight shot to a servo mounted in the fusalage. This will solve all of the issues mention above. If you choose to use a mini in the cowl, do a very though range check with the engine at full throttle. Make sure that you use a resister plug. The radio manufactures don't recommend having a conductive path between the engine and the radio equipment. Fautaba recommends at least one foot (0.3 meters). I attached a picture of both standard and twister heatdams. Good luck.

Dave