Lots to ponder.
I may well try wiring the O2 heater directly to the battery (via an ignition live relay) to see if that helps.
I do have a copy of your map, so I'll have a play with that as well - although our setups are a bit different I would imagine it's a much better platform than the hondata base map (especially considering the time you've put into testing it).
My exhaust does have a second boss for an O2 sensor (post CAT) so I may take you up on your offer of borrowing the wideband - I'll see how I get on at the weekend.
Sorry to hear about your Marlin - hope it's up and running again soon (especially with this nice weather). I'm out biking tonight (only some basic cross country/singletrack). Hope you have a good weekend.
Tim
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