Are you using Devardi glass?
I have the same set up - and work with Devardi, Effetre, Vetrofond, CIM and Lausha glass.
And, I've also burned a lot of glass.... all part of the learning curve.
In my year on the torch I have found that it is EASY to over heat the Devardi - it is stiff that it doesn't *move* like other brands. It really likes to be worked with tools rather than gravity. Colors, opaque vs transparent - each is a variable as well.
I also added a 100lb regulator to my propane tank. This has helped me a ton. High enough to keep the torch head cool, but low enough to be more controlable.
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