royston

Can anyone explain to me why all of a sudden my duty cyclehits 91% at 6000rpm at 14psi normally it hits 91% at 8000rpm(1200 secondary and 550 primary)also my knock readings are 28-38 at wot but now as soon as it hits 6000rpm it hesitates and my knock goes up to 100 +.None of my settings have changed on the powerfc or anything else.My mods are power fc,intake,dp,mp,blitz catback,front mount intercooler,mild port,cosmo pump and 1-1 regulator.Any help would be appreciated,Roy uk.