Hey Andy,
For the track in Drop Inn Racing, I suspect carpet setups are as valid as astro ones, as it is a very smooth, hard surface. The ultimate tyres would be yellow minipins - superb grip, but will likely wear alarmingly and grip roll could be a problem. Yellow minispikes all round aught to work - if not, something else is at play. For Drip Inn, Ballistic Buggy Greens and Schumacher Greens also work - my BJ4 had Scheuy Greens all round there last time, though setup was too soft.
As for diffs, that's one to ask people there about. Usually the front diff is set tighter than the rear - if the rear is too tight, you'll definitely get understeer. For rebuilding Schumacher diffs, ask a Schumacher owner, they're a bit different from most, so I'm told.
It would do no harm to get some more diff balls - I'll be acquiring some soon (probably MO Bearings on eBay, mega postal discounts), could pad out my order for you? I'll be getting some 2.5mm ones anyway for my tourer.
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