A few rosins I've been dabbing on. TL: Superboof by Sno-Melts. TR: Spreez by Information Entropy. BL: Black Maple by Peachy. BR: Fire Water #106 by 710 Labs.
Oh that’s a dope e-nail. Maybe try around 400-450 F. From what I understand, there should be no permanent or burnt in residue after a dab. The leftover residue should be easily wipeable.
As they say, sometimes you gotta waste it to taste it.
Also, quartz glass can get worn over time and lose its ability to retain heat. May be time for a new one.