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Cutting the big end of the bump stop would preserve the effective spring rate better than cutting off the softer, smaller end.
However, the point of this thread is to explain why ideally you need different profile bump stops if you fit different rate springs. You need different profile bump stops, ideally, if you fit shorter springs to lower the car.
A good argument can be made that higher rate springs would benefit from softer rate bump stops, provided the eventual resistance of the bump stop is adequate to provide a progressive rate right up to fully compressed.
If you lower your car without fitting shorter dampers you can bottom the damper unless the bump stop is adequate. Bottoming a damper will break it.
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