[Pampered-Z]

Sorry, I'm not all that familiar with LS1 setups as I am LT1s.

But here are my thoughts:

I don't think gap is your problem. I'm running 10PSI with TR6's at 35 gap, Accel coil and ignition box with no problems. I'm leaning more towards your tune.

What is your timing table? You could have too much timing in the tune?

But what I really think is you need is to switch to sensor for your boost level. Once boost get near/over 8PSI things can get tricky. Assuming LS1's work the same as LT1s, at 9 PSI you are in the area of maxing out your MAS/MAP.

Making a few assumptions here, because I don't know the details of your setup?

Where is the MAS located? People have problems if it after the compressor, need to be mounted after the air filter/before the compressor.

Also, to handle my level of boost I had to switch to a 2 bar map sensor and having the tuning set up so the ECM can “read” boost and adjust the A/F accordingly.

I use TTS software to scan my car, and I can select certain sensors to key on. If you can, scan the car and key on the MAS/MAP sensors, they are probably hitting the max and this is giving the ECM fits.