What is a PWM valve, where do you get one and how do you wire it up?Have you considered using a PWM idle valve for some extra air during warmup? It sounds like you are using the L-jet harness so you could probably reconfigure the AAV wires or maybe a couple of the AFM wires to accomplish this.
I just recently got my GTV6 running with MSII. Right now I am using the AAV but it kind of sucks since mine doesn't open very much. I have it set up like a fast idle valve (with a relay) but with the fast idle temperature set really high so the AAV gets 12v all the time.
Eventually I will modify the MSII and try a Bosch (VW) 2 wire PWM idle valve.