A4 B8 2.0T Transient fueling and burbles

Attached is a log, my current tune and a stock 2010 A4 B8 tune.

Mods include: CTS High flow cat, and custom exhaust (Magnaflow 11226 muffler, Vibrant Performance 1792 Bottle resonator)

The problem I'm having is the lean spike observed in the log file, I know it has something to do with the transient fueling, but after trying a bunch of different ways, I just copied and pasted from a file I would reference from time to time. It still didn't work. What do I need to log so that I can tune it properly or has anyone had this issue before?

Secondly, I would have thought that messing with the overrun parameter would've made some burbles and even slight pops, but I'm clueless on how it works. Can someone explain it to me?

Thanks