It's more then likely the new AP map version you loaded up. The newer maps were made richer up top and also dialed back some of the lowend timing a little. I'm willing to bet that if you went back to the old map you were running you'd see better results... might not be as safe, but the Cobb shelf maps aren't always perfect for every car. I know of people that have had good success with the old maps while others had issues with slight det and power until going to the new maps. Anyway, look there first... that's probably your problem.