The peaky boost pressures are due to the limitations of our stock turbos.
Even though I have a mid-pipe mod (x-pipe replacing 3rd cat and mid-muffler) which gave us a steady 1 PSI gain, the turbos are maxing out which causes some boost variations. Also may be partly caused by fuel availability. Was definitely more noticeable ( slightly higher lambda readings - lower FRP pressure) with a 50/50 methanol water mix , than when I increased methanol %. Torrie was reading my logging info and making tune adjustments. In fact, when I dyno'd my Flex, the best HP/Torque came from a less radical tune. At the time, I thought my numbers (369 hp & 409 TQ) were pretty good, but SHO guys with modded turbos & 100% methanol have seen 70 hp & over 100 TQ better than mine, 4DRHTRD has to be in that range now too...