I had a problem with the wastegate causing about 1.2 psi excess boost when I had stage 1. I had a damaged o-ring on the hose fitting for the boost sensing line to the wastegate, and I also had an exhaust leak where the wastegate mounts to the up-pipe. I'm not sure which issue caused the excess boost.

Any problem with the wastegate would show up as either too much or too little boost, which would show up in data logs. The shape of the boost curve over the entire RPM range could reveal if a wastegate is hooked up improperly too.

Do you suspect you have a problem? What are the symptoms. If you record a data log of full throttle acceleration in 2nd gear, from about 2000 rpm to redline, I can take a look at it and see if there's anything obviously wrong.