Given the known the MCAS problem, and Boeing air directive, I would use flaps 1 for as long as possible to prevent MCAS from engaging if pilot sees IAS disagree. Once atleast 2500 agl retract flaps to see if MCAS engages. If yes, extend flaps immediately and return to airport. WSJ reported MCAS engaged in this flight at 450 agl which suggests plane already in clean configuration. Interesting to see what fdr shows for flap settings and retraction.