Are you measuring your doses? You may be smoking over your threshold and blacking out. Try measuring out like 15mg and move up from there. There are a couple threads on dosages and administration of freebase DMT.
As far as the goo goes. I have somewhat limited understanding of it. I can only provide you with my personal experience with the stuff. Defats helped to eliminate most of the good I was seeing. I found that slow evaps as opposed to freeze evaps were most effective in crystallization growth if that is what you want. My yields are higher with slow evap as well.
When I recrystallize goo and other DMT I will always use a hot solvent (heptane). I then allow it to cool to room temperature. Then into the fridge for a few hours. Then to the freezer. Works great every time with no goo.
My educated guess on the goo is that the DMT has so many impurities that it cannot hold a crystalline form. The defats remove many impurities and allow for the crystals to grow without being impeded by these impurities.
I went from goo to nice white crystals so I did something right. I am learning with you my friend. I recommend experimenting and ask around in the chat. There are so many intelligent and helpful in the nexus to help you! Read and try out a few teks. Experiment. It helps to remember and/or record precisely what steps you took as to know what you did right or wrong.
"In the universe there is an immeasurable, indescribable force which shamans call intent, and absolutely everything that exists in the entire cosmos is attached to intent by a connecting link." ~Carlos Castaneda