Rough Idle / Running Rich after Supercharger and Z1 Tune

[overtureZ]

Hey guys,

Firstly, thank you to anyone who helps me on this issue!

So let me explain a little about what is going on..
I installed a STILLEN SC kit on my car not to long ago (2months) and had it hauled to Z1Motorsports so Jon could tune it. He did so getting the car around 425wp and everything ran fine. Even from the shop I had an studder in my acceleration once in a blue moon.
A week or so after the custom tune I notice when cold start or even at a warm idle the wideband would surge, bounce from like 15.8-13.7 approx. You could hear it in the exhaust note too.

NOW my issue is that upon cold start and even warm idle, say at a redlight my wideband stays around 10.0-10.5!!! and the idle acts very odd, choppy almost.

MOD LIST:
Stillen Supercharger
TBatts anti-slip pulley kit
1000cc ID Injectors
Turbosmart 25mm BOV
UPRev custom Z1motorsports Tune
Frozenboost exchange
Custom exhaust

Picture of wideband at idle: