I haven't gotten my hands on a Liger Air yet (nor seen pictures). Excited though. Wow, that's a low coil temp. I don't have a K-type thermometer but @ 550* coil temp my Hex-Nail's calculated nail temp is 396*. By the way 550* (30mm Liger/sapphire/2 ruby spheres/Coojo cap) is heavenly … 540* next. I used the Obsidian first with the spheres as a proof of concept before moving on to pairing them with the sapphire insert and have yet to go back.I will have to try my Obsidian insert with spheres again, as you note the Obsidian is extremely smooth and I think the way the inner bottom edge of the dish is rounded nicely matches the radius of the spheres. The Gordo Riptide caps really do get those spheres zinging around the insert! I would love to find/commission (when funds are present) a Gordo Riptide Bubble, ideally GTR (or flat for that matter) that will seal the 30mm Liger. That would be the next level.