Yours is the C18Xe then, same as mine? My Superchip made pretty much no difference, other than raising the rev limiter which is pointless unless your making peak power quite high in the revs. I have also read that people have seen the Eco engine LOSE power from a Superchip but not sure how true that is tbh.
My cams seemed to make no difference, then i was told to fit an adjustable fuel pressure reg after a poor dyno run, i set it at 3.5-3.6 bar, and now i have matched the fuel to the cams, its loads better mate. So i would suggest that. :-)
Is the throttle body just polished, or is it enlarged aswell?
Also i had a K&N cone filter sat in the front bumper, i have since fitted the airbox and its much better again. Fit a short shifter aswell mate, made loadsa difference to my car :-)
Hope this helps.
You had yours dyno'd??