I hadn't previously seen the MC 'boil three minutes then SV' technique and I confess to being dubious - boil an egg for three minutes and you're just about there anyway, I'd have thought.
But something I have read about somewhere on eG is cooking your egg SV to the desired yolk consistency per Douglas Baldwin or Dave Arnold, then giving it a quick dip in boiling water to firm up the white. I've done this and it works; the dip need be no longer than 10 seconds or so.