Oh you'll be competitive. Trouble is, the other guys running 200+ are running heavier boats with a few extra feet. Bearing in mind it's gnerally rough over here I can see that being an advantage, though I know you drive flippin well!
Knowing how light your P18 is, i can see it being overpowered easily and therefore possibly slower.
That said i know you're the same as me, you can never have enough power, so ignore all i said and bolt summit big to it mate!!
James