I also primarily hunt elk in NW NM, and the majority of the bulls I've called in have come in silently or nearly silently because the archery season is poorly timed (too early) in this part of the state in my opinion. It definitely works better if you have glassed them up beforehand and know their general location so you can get the wind in your favor and know that there are actually elk in the area you are calling. Most of the bulls I've called in have been on the smaller side, so I usually go very light on the bugling as I don't want to scare them off. However, if you do know the bull you are after is a large, dominant bull (determined by your glassing efforts), bugling is fine. I have used the Hoochie Mamma with very good success, and I do like being able to have more than one call going at the same time because I think it's more realistic. I would definitely wait no less than 30 minutes, and an hour would be better (especially if you know there are elk in the immediate area); most of the bulls I have called in have come in within the 25-45 minute timeframe.