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OK so it looks like my particular vehicle isn't trying to increase RPM on decel (rev matching). It takes about 5 seconds to go from 3k rpm to 6700 at right around 25% pedal, which is roughly the same throttle on his tune (we can change this and mine isn't linear like his is).
It takes 4 seconds for the engine to spin back down to idle, in which it hunts for idle a little bit and modulates the throttle position to do so (no change in pedal). Overall, it's trying to keep the throttle right around what it normally is at idle.
Sorry this theory doesn't pan out on my end, but it might be worth looking into on yours with some kind of monitoring device; I'd check idle valve duty cycle if there is one, as well as throttle position and compare between (hot) idle and when you encounter the issue. It's worth noting that it might be that your clutch isn't floating on the input shaft properly for whatever reason, and might still have a bit of friction against either the pressure plate or flywheel and thus, run higher while coasting.
Just a thought.
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