Quoting Removed, click Modern View to see First the qualification: I'm not a degeed EE, but I do motor and electronic work professionally, and have seen exactly what you are describing.
Yes, you can change the brush position and slow the starter, but the current will not really drop much, which just makes the starter far less efficient with the energy provided (more heat than movement). Universal motors are designed A LOT different than a starter (a lot more poles on the rotor and more field windings), even if the same basic principles apply.
I just had my 6v starter rebuilt with 12v field coils - not that it wouldn't work at 12v when I converted the electrical system, but the bendix was shot (and I was hand cranking it a 6v) long before it had the chance to be "abused" at 12v. Cold weather made the starter fix a necessity.
Maybe the extended cold weather cranking necessary at 6v ruined the bendix. I know it does a lot better now at 12v. :)
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