I just downloaded V15 and data logged it myself.. I'm not seeing increased boost spikes, but after datalogging I did observe that I am seeing higher peak boost by .5 to 1 lbs.. It seems that ECU_PSI is reported higher.. Don't know if that's due to weather changes since I last datalogged (it's about 20degF warmer now) or reporting differences in this version. I left it peaking near 22psi on boost and not seeing any timing pull in 20-85 mph runs in 90degF weather.
I was seeing something similar, and thought it might be some firmware tweaks coupled with warmer weather. I can say that FW 15 works well - I ran it for a good bit!
I just updated to FW 17 yesterday which appears to run the same, but now the map switching works via the windshield wiper stalk (intermittent speed selector is used when wipers aren't activated). On FW 15 it would work, but there was not an option to disable map switching while the wipers were activated at intermittent speeds; so that was a clear no go until FW 17.
Weather is supposed to be nice this week so I'll have to do some more data logging and report back; I'll try the most recent map 6 I saved of yours and report back.