Alright, just to recap here.

I hunted whitetails in Idaho one year and we couldn't buy a buck, so we went to rattling because 'Why the hell not?"
By the time the hunt was over, we'd rattled in nearly ten bucks of various sizes (no monsters) and I shot a nice three point.
Our method: No less than twenty minutes in one place. Rattle viciously and loud for three to five minutes and pause. Grunt on the standard grunt tube two or three times in a three to five minute break from rattling, then start right back up with the hard and heavy rattling again (3-5 mins) with a short break with some grunts.
Of course, the next year this wouldn't work.
Am I on the right track here for blacktails, or is there another preferred method?