L98 Cammed V8 with extractors and OTR intake - Cold Start Tuning

I've had a successful time tuning the car for driveability and WOT.

However, cold start i'm totally stumped, if I don't feather the throttle for a while the RPM starts to hunt with up to 230+ RPM error from target idle.

I can clearly see on the wideband & VCM scanner that the engine isn't running at the commanded RPM.

Do I need dial in the MAF or MAP differently for cold start environments? Does the MAF register different Hz for the same RPM on a cold engine vs warm engine?

BTW: attached is my latest VCM Scan

Any tips greatly appreciated ;)

Craig