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Jimmylad, EGR is 100% disabled during DPF regen. That's to avoid the unburned fuel in the exhaust gasses (for the regen), also go back into the intake. Valve might be partially closed, seems to make sense to limit air flow to get temperatures up
Are you are looking at the throttle movement with the boost pipe removed? I really don't know what the impact is, but most engine managment system use the MAF sensor info at low load, and than switch to boost and intake temp sensors at higher loads. The MAF flow will be wrong with disconnected boost pipe. If I had to guess I would say MAF flow will be higher as it's unrestricted, and maybe that is why it tries excessive corrections thru closure of the throttle
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