Thanks for that detail, I was not able to see bends in your earlier pics. The center of my vapor cap plate does have a bit of a concaveness to it but not real bends in it that I've ever seen. As part of a vapor cap tune-up have flattened a few dents by pressing them out with bottom of small dash spoon (of course after already having removed the top plate for cleaning).
Regarding the butane residue colors that form on the vapor cap, many folks here (including me) seem to use "refined" butane (e.g. vector) but the residue still appears. I've used a wire brush to remove top plate colored residue deposits a couple times by gently and lightly running the wire brush over the plate in warm soapy water. I don't know if that will cause excessive early wear and tear so I don't plan on doing it often.
Below is what my vapor cap looked like after the first couple months of usage, and after it was cleaned:
A hex wrench labeled 0.05" fit the screws of my Lotus vapor cap. The wire brush was purchased at dollar store.