Yeah Danny, 36mm vents are about right for the engine size and rpm range, especially for the most power "under the curve" (throughout the rpm range) and not just the top end. Depending on the heads (Carlos said he didn't know exactly what they were, but had a "stage 1 p&p), he may even be able to go a bit bigger, but if it has good power throughout the rpm range (goes to 6500 with power) and Carlos likes the way it drives, it may not be worth messing with.
Carlos- Have you been able to reach CE and find out anything more? It would be nice to know exactly what heads are on it. Oh- just went up and re-read your parts list, Carlos, and you mentioned a 1 1/2" exhaust, so I'll bet the heads are Tims Stage 1's with 40x35mm valves. Do you know the compression ratio?
Frank- Adjust the accelerator pumps and see if it helps. Great to hear going down in main jet size improved the mileage; did you notice an increase in power at all? Have you tried a size smaller idle jets yet?