Would an UpRev/Piggyback combination work?
I may well be getting this entirely wrong, but as I understand it the stock ecu (flashed to take into account different injectors etc) works best at lower revs, while a UTEC or similar can kick in once the boost comes on strong and can take over a lot of the control using its MAP sensor. The stock ECU doesn't have knock detection at high revs, while a UTEC has, and the UTEC also has switchable maps.
Am I well off the mark here? Would be good to know as I'm awaiting the imminent arrival of a whole load of kit!