Boosting lower on stage 1 vs stage 0

I flashed my car today to stage 1 and I was running 12.3 pounds of boost. I decided to flash to stock and I was running 14.8 pounds of boost. Checked for leaks and I couldn't find any. I need some help. My valves do have a lot of carbon build up, so, could that be the problem?? I have a SRI intake and Turbo Inlet Pipe. Thank you! Also the maps I'm using are just the OTS COBB maps!
2014 Mazda3 S GT auto, 2008 MX5 6-speed
It appears that you are in the wrong section. This is for Mazda 3s, not Mazdaspeed 3s.