the injectors as std don't have the headroom at 3bar to safely run a k03s properly
maybe he doesn't intend it to make any more power than it does now - or maybe he doesn't have the tools/knowledge to adjust the timing of the injectors (more likely)
you do need to ensure that your fuelling is 100% spot on, remember the Ibiza lambda probe isn't wideband....
I think I'll call him again tommorow now I understand the fpr's a bit better. but I wouldn't have thought he doesn't have the tools/knowledge because he does alot of VAG work inc. big turbo upgrades and I've always found he knows his stuff.