You have something really wrong going on here. I see the pedal at 100%, but the actual throttle only goes wide open (99) for a short time, then drops back down to 50 or less. This is the ECU seeing something wrong and almost like it's going into limp mode.
Double and triple check all the jb4 connections, maybe something is wired wrong, especially the
EWG wires, it's easy to get them pinned into the wrong places in the jb4 connector. As a quick test, byou could remove the
EWG wires and connect the wastegate directly back to the factory harness. The jb4 doesn't require them for most applications.