Sounds wise. I doubt the extra wear is from "slam so hard". In all auto trannys I know of, excessive clutch wear comes from a slow, slippy engagement. Think of a new driver operating a standard transmission, burning up the clutch. To avoid wear, you want firm, quick shifts. That is what "shift kits" are designed for. The manufacturers tend to make the shift slow and slippy because that is what clueless customers think means "good transmission". The shift kits make it more like an educated owner wants (though some are geared to racers only, w/ full manual control, reverse shift pattern, etc).

When I used a shift kit in some 1960's Chrysler trannys, the instructions had you remove some of springs in the actuating pistons and/or replace with a weaker spring. You also removed some balls from the valve body and drilled a few channel walls away. I recall it was the accumulator piston springs you buggered with, but the reverse piston springs in your M-B tranny must also be to slow the shifts, so same idea. Afterwards, the shifts were firm, but not bothersome. Indeed, not sure I could tell a difference.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans