Try a clearaudio clever clamp
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I'd just stop using the felt washer for thick LPs. That clamp can't really apply enough force to correct bad warps with heavy vinyl and the small warps aren't going to affect the sound that much as long as the LP is clamped down to minimize vibrations. Or, you could buy the Michell clamp that's modified for short (Rega) spindles and use it for thick LPs.
I use the same Michell clamp you have on one of my Music Hall turntables and have a threaded Michell clamp on a Michell Engineering turntable. But I've given up trying to correct warped LPs using a clamp and instead invested in a record flattener. It seems to work OK and I don't have to overtighten clamps to accomodate warps anymore.