Rear axle compliance

I want to limit the lateral movement of IRS in VW 1302 Super Beetle, because the displacement of rear axle construction while steering action does affect on the function at the initial rising stage so much. Dull and muddy reaction should be eliminated if the astringency of the steering response, otherwise the advantage of light weight 850kg could not be taken some advantage as a passenger's car that is very rare now. Refreshing, gloating and cleverer riding taste could not be obtained until the escapement of steering power input should  be closed everywhere of axle construction, so the lateral arm inner bush deformation behavior would be changed as a experimental attempt today. This kind of reversible modifications could be permitted for an enthusiastic amateur like me, because the condition could be set again as it was without any destruction, if it turned into worse result. I'm sure the steering action would be far improved after the experiment judging from my deposited experiences. I'm going to measure the size of inserting thin rubber sims from now today. I have 9 hours from now before the Ashiya Symphony Regular Concert begins at Fukushima Osaka.