different brands/tire models of the same size generally have slightly different profiles 205/50 or 205/55 will be the only car tire in a 17" that works at all, I didn't have any issue with running a General Altimax Arctic 205/50 on my '07 Vee
you could also get a custom 15" or 16" wheel made and the tire size options expand exponentially
If I were you I'd check the rear wheel alignment using a straight edge rather than the marks on the swing arm. I don't trust the marks for fine tuning, so I put a straight edge on the tire and align it with the chain and sprockets.
This is just a guess, but I'd bet this is why we hear where one tire will rub on one bike, but not on another. Misalignment.
Also make sure your sprocket carrier bearing is ok and that the cush rubbers are tight. They should be hard to press into the hub. If they easily fall out they need replaced or at lease shimmed with some pieces of innertube.
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