That's strange, I have a neu/quark setup in my e-maxx, but I've never noticed anything like that before. Usually if I'm going really fast I'm worried about it flipping if I use the brakes. I don't know the brake settings that well, because I kind of set it and forget it, but I can't think of why it would do that for you, sorry.
I am located in Melb, when the brakes come on they are really strong, also this thing really hauls ass no speed checks but I am sure its near 100kmph or 60 mph with 5s lipo and the 2200kv motor anyone else go any ideas?