My Cooper One with 90hp is pretty sluggish???

Hello together. I have now changed from several VW and Audi to the Mini One. Thought the 1.6 16V with 90 hp would pull well but think. One has now driven Polo GTI a lot or the 1.6 8V 75 hp or 1.4 16V with 101 hp and they all ran around classes better. Mine was driven by an azubin. I think always undertouring. He runs with quite, much effort 170km/h. I have now renewed spark plugs, the air filter was thrown out because everything looked like first set. ffener K&N in it to test if it gets better. Pustekuchen. Even in the appearance he is in it with over 180km/h. So what can it be? AGA tight? He has now 120tkm down. Thanks for the help