Brother. I've never used the Machine, so I'm probably not the best one to answer this. Aside from getting a new tool, like glass VG, or something. I would say that it simply sounds like you are not applying enough heat for long enough. I think you're being very appropriate in babying the heat until you start to see some vapor wisp away, but at that point don't be afraid to get a bit more aggressive to insure the process continues. I think you're on the right track, just keep pushing the heat. If you accidentally go too hot, and burn it, you'll know in an instant!
Just take that as a learning experience and back off slightly the next time.
One additional thought would be to try a torch lighter, but I don't know if those will work with the machine, or cause you to just inhale a bunch of molten metal smoke???
EDIT: You'll know when you're vaporizing it effectively because you'll feel it in your lungs. It wont be too hot, or smokey or choking feeling. It will feel like a curious tickle, and you'll know it when you feel it. You'll be surprised when you exhale because the amount of vapor that comes out is far more than it felt like you had inhaled.
And yes! You can absolutely break through with eyes open. It's pretty damn amazing, but has a different "character" to it... At least for me.
Anyhow. I hope I've helped in some small way. Let us know how you progress and good luck my friend!
Peace
-idt
I am not a drug addict seeking escape from reality. I am an explorer of consciousness challenging consensus reality.
…is DMT dangerous? The answer is only if you fear death by astonishment… [crowd laughter]… Remember how you laughed when this possibility was raised… a moment will come that will wipe the smile right off your face.
-Terence McKenna