I have a track day at Snetterton booked for Monday the 2nd and need some advice.

I had the TBs set up by the lads visiting essex hoping it would fix the hesitation my 2002 Mille gets roughly between 5000-6000rpm but it doesnt seem to have fixed it although it fuels perfect now the rest of the time( cheers lads).

It pulls nice and hard before and after this range and seems to intermittently get this hesitation. (although its most of the time its got new plugs etc

Any Ideas ?

Mods are:

Early type open lower airbox boot
Aprilia Titanium can
Dr Rossi chip
K and N