Did a quick 4th gear pull on the highway to check AFRs at boost, but when i checked the log, it shows erratic MAP readings. Im worried this could be a sign of preignition. anyone have experience with this anomaly? fluctuates between 160-170 kpa, as the attached photo suggests.

 

The difference between 160 and 170kpa is 1.45 psi. It's probably your wastegate door not holding steady and oscillating as a result of your timing fluctuating so much. Reduce the difference between rows in that area and see if it doesn't settle down.

 

It basically mirrors your timing.

Impressive.

 

First thing I noticed as well.
OP, post log and tune...

 

My point was if your tune is such that 1.45 PSI will make a significant swing in your spark timing then that is likely the source of your oscillation.

 

Tune and log attached. I tried to make a smooth slope in the timing as boost is increased. If your responses are anything to note, it looks like the slope could be too steep?