Ah yes, the old 4-5K fuelling issue. Here's the good news, the PCIII, if set up properly, will eliminate it!
A couple of other tips I should have included in previous post. If you're going to have it fine tuned on the dyno, try to find a Dynojet tuning centre that has the new "Tuning Link" software. I think there's only about 9 tuning centres in the country at present with the new software, but it really is worthwhile to find one and have the bike set up there. The advantage of the new software is that instead of having to go the old route of runing it up on the dyno, altering map, uploading new map to PCIII and then running up on the dyno again to see if changes have worked (repeat ad-infinitum), the "Tuning Link" controls both the dyno and alters the PCIII in real time! It also allows for simulation of real world driving conditions, where you may have a bizarre combination of RPM/throttle position etc. rather than everything being mapped on full chat, full power runs. In addition, time scale for set up is dramatically reduced. On average you're looking at approx £60 - £80 for full custom map and a bike that runs like dream! So if you buy from my contact in the States, you've got the PCIII plus full custom map for less than you can buy just the PCIII for in the UK! You know it makes sense!!!
Finally, if you are having the bike set up on a dyno, make sure that they don't just stick a lamda probe up the tail pipe. Remove the blanking plugs from the primary pipes and insert a probe into each. This will give a true reading for each cylinder individually and you can then take advantage of the PCIIIs ability to offset the map for each cylinder. Result, both cylinders working exactly as they should, more power, smoother running.
If you contact Dynojet UK (01995 600 500) they will tell you where all the "Tuning Link" centres are.