Roadman,

Welcome to RCU. Try and raise the fuel tank as high in the nose as possible as your first fix. You want the center line of the rubber stopper at the same level as the spray bar (needle valve) in the carburator. Give that a shot as it sounds like you're having to draw fuel too far for the engine to be able to start and run.

Hogflyer

Edit: You may want to pay a visit to the 1/2A forum. We specialize in .15 and below (down to .010), and the smaller planes - generally from 36" on down. There is some info on the TT .07 there that may be interesting/helpful. Also do a search on RCU for the TT .07 for more info.