I'm not an EQT fanboy but their stage 2 tune not only fixed the surge but pulled harder than the APR tune.
But if I could go back, I would have stuck with the APR stage 1 low torque tune. I might still be on the stock clutch and not have to listen to the harsh cacophony the car makes with...
This is a wastegate issue (that effects cars '19 and newer IIRC). My APR tuned car did the exact same thing.
I read that EQT solved the issue, so I switched to their tune and it solved the problem. Don't know if APR ever fixed it.