Like Mopar Jim said above, sure sounds like your bypass valve is opening.
Without seeing your log we can only guess the reason why.
Please keep in mind this car is always trying to protect itself. If any of these sensors report back something is Off compared to what has been entered in by the factory or your tuner, the Valve will open. Make sense?
You are running the Exact pulley combo as my brother. Ive been polishing his tune for two summers now using different fuels. Without a tuner watching over your logs as Adrenaline pointed out above Risk is high.
Your issue caught my eye in the title as twice last month I experience this same issue in my own car. In my case, the tune was not the issue. So also be aware, there can be mechanical reasons as well.
One thing is certain, 6lbs is pointing to an underlying issue that will not go away. I can take a look at your log if you are using HPTuners and point the right direction if this helps.