Leica M3, Shutter Issue?

[Hintsalae]

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Leicas shutter just works that way. Both curtains travel across film gate at same speed. Different exposure times are created by delaying the closing curtain and that way different gaps between opening and closing curtain. Openin curtain being slower causes closing curtain catching it up and narrowing the slit towards end of the exposure. If your closing curtain is slower then it would cause overexposure.

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[TLCLeicaM3]

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After the service - "seeing some peculiar behavior on the negatives" - The OP

Well just after a PROPER service, these image ruining flaws should never appear. "Proper" will mean that the old lubricates have been evacuated and new ones introduced. "Proper" means that a tech, with a quality tester, recalibrates the shutter curtain tensions & slit-widths, THEN waits - - - The tech waits for the new adjustments to settle down, THEN to do that all over again & again until the speeds stabilize (no longer deviates after any incremental changes). Mr. "do it fast & cheap" obviously doesn't take these extra time consuming quality-assurance steps...

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"they’ve been flawless at all speeds" - Mikemgb

Sorry, but with as many of his recently serviced units that I've personally checked, that statement is highly doubtful...

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"all the videos I've seen only talk about increasing tension" - James T Doe

Because over the years, many so-called techs "tension'ed" the shutter barrel springs in order to power through the failing lubricants, one should never perform DIY tension elevation of these shutter main-springs. It's much safer to loosen either the 1st or 2nd shutter curtains.

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"Might be fixable easily tensioning the curtain spring" - Hintsalae

The same comments as before, but with the additional fact that the rubberized silk shutter curtains are now over a HALF CENTURY old, de-tuning the shutter tensions is therefore highly advisable (that's what I do to virtually every 'old school' cloth focal plane shutter)...