what does this mean...

I'm autotuning away and trying to populate the 100% WOT column - running in 6th (with no one around ) the bike pulls and pulls but rather weirdly, when I gently back off on the throttle I literally get a kick in my pants surge ??

in other words it feels as if less throttle pulls quite a bit better than 100%

does that suggest rich or lean in that column at those revs ...or is that just life??

cheers