What 17.5 motor would you all recommend for a FT b4.1 8mm running in a blinky class?

I run at a medium size indoor clay track. My Tekin 17.5 isn't fast enough to keep up with the fast guys at my track.

I make the A-main every time but never finish higher than 5th. Those guys are always pulling away from me, especially in the tight sections, and they won't share their secrets!

in case it matters, i have a very smooth driving style. Running 72/33.

FYI: I saw that one of them was running a revtech on Sunday but I have no idea about the rest.

Thoughts, suggestions?