Hey Mike!
Glad you got to go to the dyno, looks pretty good. Dyno Dynamics should read lower than what you see on most other makes of dyno.
Remember, the numbers quoted from the Golf R were on a DynaPack.
About the "surge"........
You can see it in the MAF data. You can see it in the boost data and you can hear it. Everything about it adds up to surge and surge is something you always want to avoid on a turbocharged application as it can create a premature failure of the turbocharger.
That being said, you are not experiencing the classic or standard definition of surge. Your turbocharger is perfectly safe. As I've stated previously, I'll speak more about what people are calling "surge" regarding the ko4 and 2.0T FSI soon.
I don't like that dip. I want to fix that. I am not sure what it is but my car does not do it.
Is there a time in March when I can trade cars with you to work on the dip?
Cheers!