is it tuned or not

[spawno88]

ok, so i have just bought my first 306 td, and i really love it , its the sport spec with mountains of service history, totaly standard, done 130000 miles and it drives like new, for the age i really cant believe how good of condition it is, however there is just something playing on my mind, it has a derve doctor optimization receipt and derve doctor sticker in back window, it pulls very well however i think considering it was tuned by derve doctor i feel it should have just a bit more go, any ideas guys, dont get me wrong it does go, but not as well as what i would exspect, it was tuned in 2006, so do you guys think it may need a new tune up, it has been serviced pretty much every 3 months too, so it has really really been looked after