AMG A45 M133 Tuning Issues

Hi All, having some tuning issues with an AMG A45 M133.
I'm not the tuner and don't want to name anyone.

Mods are AMS intake, catless down pipe.
Road test in gears 5,6,7, open up the throttle partially to accelerate and at 2300rpm - 2500rpm the car is shuddering while accelerating through the rpm range.
Tuner said he thinks it's compressor surge, boost is hitting 290kPa.

Road test in gear 4 at 4500rpm - 5000rpm at WOT, the ecu occasionally pulls back power until you get off the throttle and then back on again.

Anyone seen this behaviour before or have any ideas about what I can suggest to the tuner to resolve these problems?
Tuner says he's done many A45 tunes and has never come across this problem.

Thanks in advance.

Wastegate and thorttle they work together

You need fisrt check your wastegate duty cycle

Attached your file here