that may be more work than scouring the yards around here for a replacement weekend after this one.
I do like the idea of essentially creating a deeper hole for the bolts in the flange by installing a thicker (taller) bushing. hmm. something to think about.
Personally I don't worry too much about the output and diff angle matching perfectly and I'm willing to let the 2-piece drive shaft and CSB fudge it a little bit.
There are aluminum and poly-bushing replacement quibos out there if I was of a mind to resort to a stronger connection (but if things turn out to be indeed off, I would rather break a quibo than crack metal, so I wouldn't move on to that step yet).
My '79 3 series (E21) uses a small-case LSD but the mounting is pretty much like the E30 and the one-eared diff cover is connected to the chassis by an aluminum dog bone with stiff poly bushings top and bottom. I have already cracked one diff cover wide open after fairly limited track service, and this is with an M20B25 motor that I seriously doubt is even doing 160hp at the crank. The force is strong with this one, apparently.
Getting the balance of firmness vs. shock durability for rallycross definitely takes some figuring out. I considered a metal giubo but I think keeping the rubber one makes sense for the abuse. Likewise, I considered delrin for these bushings, but a stiffer poly seems the right balance, given the rough courses we run and my upgraded torque/hp. Josh Hickey (irish44j) runs delrin for most bushings, but he's all "I run a smaller 4cyl and never break my drivetrain! nyah nyah nyah!" 
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