I use autotap on my Corvette, you may try: www.autotap.com. I believe they also log ISO.

I am very lucky with my corvette I can log with autotap and use LT1 edit to write to the ECM...

Have you thought of running a wideband O2 sensor to see what you are running in terms of AFR ? PLX makes add on system... just a thought...

I have been waiting as well to see if anything was available to tweak the ECM on the Crossfire's even though it is still fun to beat around in...

Mo