Yesterday i was talking to one of the toymod board guys, i think it was Rod, appologies if a get it wrong, very sorry i didn't grab your name.
He was very helpful telling about the upgrade they do to the celicas with 4 pot hilux calipers and they fit underneath 14 inch wheels! This is exactly what i'm looking for! I love the factory 14's that come on the ma61's. So that "might" be an option for ma61's depending on clearance.
Mine doesn't stop either! i know where your comming from. Changing the springs helped alot, i know its got nothing to do with the brakes but it stopped the front dropping three inches before the brakes attempted to work.