I don't think you can consider all those claimed increases to be cumulative. You would need each of them to get the benefit from the others. A dyno would show it for sure. Also, the hp increases you are noting are at the hp peak, up near redline. Is that the engine speed you are using for taking off from a standing stop?

Interesting observation on the increased engine braking. Engine braking is a function of restriction in the induction system. Did you change the transmission software so that it shifts differently? If not, then your observation of increased power due to reduced intake restriction is at odds with what you are noting on perceived engine braking.

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