I've got no way to prove this, all tinfoil hat. But there's something to the headphone cable being soldered to the voice coil that gives Grado their clarity. 3.5mm ruins that.
If you did want to leave the grado wiring intact, you might be able to strip the sleeving/insulation and replace it with something lighter and more pliable, but it would be a huge pain and I imagine the solid core wire has a lot to do with the memory aspect.
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