no mid-range throttle

[tallyram]

i'm having this nagging problem. once my equipment gets hot i lose all the midrange throttle. i'm running a bk 12020/lmt 1950/8 combo on 6s lipo. its really hard to race without my midrange. i put a fan on the esc and it only gets to about 125f-130f. could a 140f motor have anything to do with it? please help!