I'm running a Tekin RSX in my a700 in Stock Class (21.5t Blinky)

Since I have installed the latest update my cars seems so much slower? I have lowered the throttle freq which has made it feel better, but it still seems down on power compared with before?
To make matters worse, I have a few fellow racers I was able to keep behind me comfortably but now my car seems down on power?

Any help appreciated!