Watching the wind is good but I don't get overly concerned. Lots of times I've had them down wind for 20+ minutes, if you can't get the wind in your favor just go for it.
If they know your there stop trying to be quite, no noise can be worse than not making any. If hes not coming at some point you got to do something, walk in one him at a angle 45 to 60 degrees type of thing if possible. Light grunts the kind both cows and bulls give when there curious, don't over do it. Any cracks and snaps or crunchy snow as you move are just natural sounds. Late season moose seem to loosely group together. They'll quite often the angle thing towards your rear. Some times you don't get closer but a shooting line might open up.