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Take a log using your AP and check to see how the boost curve is fluctuating.
Edit: coming from an STI myself, I found the EJ series motors much less confidence inspiring. Sure, forged pistons and a solid hone helps but for that sort of $$ you're up past 400/425 in one of these.
I think part of what you're feeling is the crazy long torque curve. The STI hits mid 3k and starts to taper at 5ish. The 135 hits on command and holds a little further, so there's more time to feel fluctuation.
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