I was also using castable and curing e envision tech curing system. I had issue w the envision tech curing system was curing too fast or too potent for the castable wax so was cautious on the time as the normal resin from envision tech wouldn’t get burned or cured that fast as formlabs curable wax. It was a hit n miss the only good castings I had were of simple and small under two inch pieces anything bigger would fail at casting