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I can't answer for sure about gear reduction starters and the lack of or need for shims. What I do know is that a wrong flex plate or a worn gear on that plate will cause problems. I had a guy across the street from our old building (still there, but I don't see him as often as I once did)...
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There should be a support bracket on the back of the starter too - that helps keep the back end from wiggling around under thrust at startup.
You definitely may have a shim or two or several missing from under the starter sandwiched between the bottom of the motor and the top (mounting face)...