One of my to-do list of things on my car...
Since I have a very early Serial# and questionable age and source of components when built.
Even if was a new suspension during the build the bushings are all soft rubber for a family sedan.
Personally I won't go so far as needle bearings or Beryllium Copper bushings since I'm not a racer.
BMW E36 Performance Suspension Components
Active Autowerke E36 BMW Differential Support Bracket (DSB) - $265.00 | Active Autowerke
So whats happening when the hop occurs take a look at this 2015 Mustang video. The principles are the same.
The fore-aft motion of the wheel causes the breakaway. But the other areas (Diff) are all over the place as well.
[ame]https://www.youtube.com/watch?v=91kQSQ8NHME[/ame]
IRS cars typically suck at the strip.