That 12mm face shim holding the rebound stack off the face could have been letting some fluid back through as free bleed in the compression direction too. Depends if the force is enough to flex the whole rebound stack backwards over the ports to close them off.
Pulling a 20x.1 out of the mid comp or even letting a touch more free bleed past the base (maybe a 26 or 27mm bleed shim vs the stock 28mm) might move let you find the happy place. Not hard to drop a few mms of oil out of them in the interim either.
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