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Thing is, on a road course, loose axles are going to mean the wheels and weight will be shifting back and forth. It might not seem like much, but that 1-2mm of shift could come into play between keeping a straight line through curves and wiping out.
Sorry for the delayed reply to this topic but SpyDude is onto something there. Since we're dealing with 'unfixed' wheels, a limited amount of side-to-side movement(mechanical term: 'lash') of each spinning wheel appears to be vital to it's overall performance. On most cars, the wheel 'lash' becomes adjustable when the axles are loose. However, I believe there exists a happy medium where the axles are loose enough to adjust with just enough resistance to hold their position when the car taps the siderails.
On that note...the older Chinese-made BMW M1s are known for having super tight axles right out of the package. My examples require the use of needlenose pliers just to budge them.