It's nice to know that you found it a bit better without the lambda sensor & no signs of going into limp mode as suggested.
Just because it no longer runs lean, doesn't automatically mean it runs rich.
It's not called failsafe for nothing.
I must try it with the 650 as a looksee.
I did once disconnect the lambda, ait, map & pair on another bike for a trial & the bike ran absolutely lovely - almost like a nicely setup carb'd bike ;)