Our remapped Leon - no DPF - produces it's power in pretty much the same way though so maybe it's just a big turbo'd, remapped characteristic
I'm suprised the Leon peaks so low too. Power is just torque x revs so usually once the revs rise past peak torque the torque drops but not enough to keep the power from rising slightly to a gentle, wide peak, then start to drop down again, rather than a sharp peak in an N/A petrol..
Hmmm I think that maybe all the engine management issues associated with the removal of the DPF maybe prove to difficult/costly to make that a viable option !!
Oh and the fact that it'd never pass the MOT smoke test
I think the ECU issue would be sorted with a voltage clamp, you could use a multi-meter to measure what the voltage from the DPF is when it is mid-way between regenerations, then clamp that voltage and remove everything. Should work unless there is some diagnosis feature that tests the DPF at start-up or something..
MOT smoke test is useless, both my old JTD and my Mondeo smoke loads under load but not a puff when just revving at idle.