Is the ECM factory stock or have downloaded a stage 1 map? Does it have a black box fuel enrichment?
Curious, where can you buy Premium non-alky fuel. Highest I have seen is 89 and the METB was removed. The sign may say it but....
The stage 1 download spark tables are pretty aggressive. Did you buy the SE super tuner dongle when you went with the stage 1. It would be easy to figure it out using that.