I’d recommend anything with soundstage. Beyer Tygrs, AKG K701s… and my favorite (but definitely not popular) Monoprice M650s (these were on sale for 80$ recently).
I have T50RPs and they’re also very… “versatile”. Do you think your T50RPs have too much highs? You can try this free mod.
If you want to try a muddy “U-shaped” sound, just move the foams 45 degrees so they’re blocking the corners of the square planar driver. That’s interesting. Nothing to cut or break etc, just move the foam.