Stainless steel draping
If the glass touches a surface, it will pick up that surface texture and be less shiny. Also, make sure you are using MR-97 and not just any ole BN spray. I first purchased HiTemp 1800, and while it worked as a glass separator, it left a haze on my glass. I’ve never experienced this with MR-97.
Jester’s Baubles Fused Glass Designs