I found the old ones to be the most transparent but they did break easily (although more stretchy and durable than the cheapo thin foams which just tear when stretched too much).I only use the hiegis for donuts and full foams, and the bulk thin black foams that @seanc6441 mentioned
To me, the thin black foams are better than the VEs. The VEs tends to disperse the treble, making them splashy compared to hearing them without foams.. Not to mention they are itchy, prone to tear and stretch, crumbling and leaving small debris on the ears... and also the color easily wear off and stains the ears and buds by slight moisture/sweat. Haven't tried the new monk foams though, just my experience with the older ones
The new VE foams are thicker slightly, so better seal for bass but slightly less transparent.
About the treble as you said I think all the thin foams don’t tame the treble /mids much but they do disperse it slightly, but no more than regular full foams? I also find that the regular full foams dull the sound and veil it, but the thins can actually bring it forward and only lose 5% clarity maybe.
My preference for most buds is regular donuts, they are the most natural sounding and just tame the treble slightly and add a slightl amount of low end, but the thin monk foams (new pack) do work very well in these cases when you need clarity for the treble and a slightly filled out (dispersed) midrange to add a thick/lush quality to buds like the RX1 which are slightly lean sounding without the foams.
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