@invertedisdead Here’s an experiment you might want to try sometime:
Have someone heat two sessions in another room for you, one with a torch and one with an e-nail set higher than the temp you want to use (similar to the temp it reaches with a torch if possible).
Before hitting each one you would let it cool to the same temp, keeping the variables more limited.
I‘m sure you already know more about this than I do, but I suspect that some factors like whether you’re starting at your desired temp or overheating first probably make a difference.
I’m pretty sure all of the temperature measurements we’re getting are based on surface temp, so if for example the temp is noticeably higher deeper in the quartz (is that possible with quartz this thin?) it may affect how and how fast the surface heat is replenished.
Maybe this is all nonsense, but narrowing the set of variables could help to determine whether heating method (torch vs e-nail) matters much in the ability to saturate glasswith heat or if max temp reached, heat soak time, etc. are making the difference you notice.
Oh, and trying different holes/patterns and even removing the balls if possible would be great to explore! I’d bet some people would really like to buy one ASAP even if it’s not perfect though, so you might want to at least take some pre-orders or reservations and get some made while still ordering other versions to test, especially if you can’t get the prototypes made quickly.