my mm and mmm problem

[q8-maxx]

hello,

I have:
mmm + neu1515 1y + 16 cell nimh + e-maxx
mm 5700 + 12 cell + rustler

when I push full throtle there are to slow to go back for normal so now has slow response not like before

Its don't want stop untel hit the wall Its very slow response I broke my emaxx and rustler bumpers

this problem doesn't exits in old frimware

What do you think?