probably not enough pinion bearing pre load now, try tightening it a little more, it takes a lot of force to crush the sleeve, so if you use a normal ratchet or t bar you are unlikely to over tighten it. if it was me, I would nip it up a little at a time and see if the whine goes away. I would say no more than 1/2 a flat at a time, worth a go, after all your time is free !
cheers, Ian.