Bill, do you have any idea who or why your variation was chopped? Seems like a pitch worth climbing if it truely gets a 3+ star rating.
As for power vs. hand drilling; many of the bolts/anchors that have been replaced lately at Beacon have been done with power drills so I don't think you would run into any problems running a drill out there.
I am interested in this variation since I have been on YW several times and never noticed the chopped variation you are talking about. Lastly, 2-4 bolts in 70-ft of climbing does not sound like bad bolt placement to me as long as no good natrual placements are bolted. Good luck reestablishing this variation; I hope I have the chance to try it this summer.