The kit for the O2 removal has blanking plugs for the wiring harness fitted with resistors which should (I believe ) make the ecu think the emissions unburnt fuel to air ratio is constant and stop the ecu from tweaking the fuel mix. Just bought ecutune but the cable hasn't arrived yet.
The odd thing is, the first ride over to a friends (about 3 miles) was brilliant. No low rev jerkyness to the throttle. Nice pull on acceleration and no stutter. Stopped off for 15 minutes, restarted the bike and started stuttering before I reached the end of his road