Running a TD on a tank like a wedge is a pain in the #@@. It never works correctly, at least not for me. It always has it's shortcomings and the constant fiddling to get it to work correctly is just wasted unused flying time. I would highly suggest to run it on bladder for beautiful consistent runs. A small tank can be made from a fluorescent T-8 light tube guard and balsa end caps. At this stage, the tank isn't relevant to height and can be placed anywhere. TD's on suction just aren't very happy. I've made various styles of tanks, however seeing that you have a lot of experience with speed engines and the likes of, your knowledge would be most helpful to running one with a hard tank. You need a narrow tank with the rear end pinched down to hold the fuel in that rear corner just like a coffin tank on a speed job. This not only keeps the fuel load at the pickup, it keeps the pickup inline with the fuel inlet of the TD spraybar. Moving the tank pickup outboard which is just what a wedge tank does has the fuel traveling outboard then inboard to the engine putting it in a automatic lean condition. If the tank could be designed to sit within the fuse and directly behind the engine, I feel it would give you far better results. Don't center the tank from side to side but favor the outboard side with your pickup. If not, design a narrow tank like I mentioned with the rear corner pinched in and try that. For as simple as a bladder tank is, it works extremely well . You always have the balloon slack tank which also works well. Ken