Did you adjust VTA for the thinner record? If not the VTA would be going positive so the sound would be somewhat thinner. Not to say that the recording is not thinner as well.
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No relation between thick and thin.
Some cartridges are more sensitive to VTA than others.
Additionally, "Morph the Cat" is a terrible recording. The bass is totally unnatural and out of balance. I'm surprised Fagan, who is extremely particular, approved the release as such.
"Everything Must Go" is much better.
I have thousand's of 120gm and less vinyl and they sound great. It has more to do with the pressing and what copy of te master they used to press the vinyl that the thikcness.
If you don't or cannot adjust VTA and most of your LP's are setup for 180gm vinyl, you will get less bass and more treble emphasis than when the tonearm is level.
I think it would be a lot easier to keep a thick mat and a thin one on hand, and use them accordingly.
Yes, I have many decent sounding Dynaflexes - at least when I play them on my turntables. They don't sound thin at all, and I don't obsess with constant VTA twiddling.
Note, that since I started using an arc style protractor and optimized my alignment, I find my rig to be less sensitive to VTA settings.
There are a few current active threads on the topic of arc-style protractors if you're interested, including the one with Feickert in the title.
Thom @ Galibier