2008 TE 250 (Athena 300) MPG

Hi again,
Without exactly knowing how much CO emissions reduction does exactly the lamda probe provide, (I'll investigate later) I've installed a switch on the handlebar to swap from probe to lambda suppression resistor and back (This is the ressistor used to eliminate the ECU probe failure alarm).
Under the fuel tank, I've also installed a 4 fields relay driven by this switch possition.
The relay toggles one 2k2 ohms resistor and the lambda probe.
Yesterday I went testing the invention and the swap works overally fine with just one thing to mention which is, that in order the ecu to detect the probe after changing the switch, the kill switch must go under an off/on secuence. Otherwise, the ecu does not control injection with the probe.
During the test was cool to be able to enable and disable the probe since it helped a lot to compare the engine behaviour with the eco or the race mode almost instantly.
The behaviour is much better in race mode without the probe. Also, with the probe, the engine seemed much louder and prone to banging on reducing revs. Appart from reducing fuel injection I think the ecu plays with spark timing to obtain such louder noise...
DBKiller is advised on eco mode... Next project is to build one since last owner did not give it to me...

Can anybody provide any clue about spark timing tuning?

Here below i pass a couple of pictures with details.
Cheers to all.