Before going the LF route, I suggest that you take your Hasselblad and buy (or rent) a very large, heavy tripod, and spend a week or two shooting only with the 80mm lens and keeping your camera always on the tripod, even when you're carrying it. If you're not frustrated out of your mind by then, get the LF stuff.
Incidentally, since you're in NYC why aren't you shopping at Lens and Repro (which is almost a national treasure, though their prices can be a little steep)?
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