A lot of drivers do not use the front motorplate support to allow more flex. I also do this to create more drive on low grip tracks. But I do not want the chassis to flex inwards during a hard landing. So i made an (ugly
) nylon block under the plate. So it van only flex to one side.
Bonus transmission tip: if you ever had any of the lugs breakoff the transmission case. Just put the same size shim you put under the lugs also between the transmission and the chassis itself. So any load is carries by the whole casing, and not just the 4 lugs.