as i ran my tc5 at speedweekend 2012. stock chassis, ae lipo retainer.
I fiddled around with new holes ect to move it around to eliminate the use of weights, but went back to the stock battery holes. i raised it up off the chassis level with some 2mm shims though which might have helped with battery holddown tweak. didnt really need anything inboard to stop it moving this way.
lipo tray not in this pic, but battery in the same position.
i might bring this car back for speedweekend outdoor. but my team magic is so nice to drive in stock.. not sure about entering the tc5 in mod would probably swap them.