if the maf curve and injector settings are good. then you enter in the desired AFR is the "base OL" table.
be sure to consider any modifiers or adder etc etc for WOT, i personally like to disable/null them all out and attempt to run solely off the Base OL table.
when i nail it in the my car, the LAMBSES change to 11.55 and the AFR changes pretty fast and tries to nail 11.55 (my maf still isnt perfect but its close.
depending on your accel enrichment and transient enrichment you may either get a slight split second on rich or lean (in relation to lambses). you can work with those to try and minimize that.
but as soon as your LAMBSES change to your high load lambses, the AFRS should start running them quickly.