low performance

[tallyram]

i'm getting low performance from my g2r. the throttle on my dx3 feels really spongy and there is barely any difference in speed between 1/2 throttle and 7/8 throttle. seems like this would be the controller's fault. i'm running a bk 12020. i read about someone else with the same controller and the same issue. i tried reprogramming it, but ended up with the same result. any thoughts? btw, i'm using a 1950/8t with 6s lipo. thanks, tally.