Help Correct Wheel/Tire Setup?

[Jeyz_640GC]

Hi All!
Just got some M6 replicas installed on my 2015 GC.
Size : Front tires: 245/35 R20
Front wheels: 8.5J ET33

Rear tires: 275/30/R20
Rear wheels: 9.5 ET38

Problem: When accelerating, I’m experiencing a slight but a“hiccup”. I’m thinking it’s the tire/wheel setup that’s causing the issue. It feels exactly like and an issue I previously had with after market wheels.

I’m hoping some can confirm my suspicion