From what you describe and reading about your set-up I see a few likely factors at play here:
First off, you mention all of the smoke. That sounds excessive. I'd guess that you missed some amount of wax in the steam-out. You describe putting the mold over a pot of water. That method may not force enough hot steam deep into the mold. We use an off-the-shelf steam generator like used for wallpaper removal. We run the steam through a tube up into the mold and it works very thoroughly.
Secondly, I can't vouch for the wax recipe you use. As Mary Kay mentioned above, we use a type of wax called "Victory Brown Wax". It is a type of material known as a "microcrystalline wax". It is purpose designed for use in models for lost wax mold-making. It steams-out well and what amount remains to burn out does not contain significant contaminants. Additionally,its dark-brown color makes it easy to see when you're assessing the remaining residue during steam-out.
Regards the statement that you should remove the wax as soon as possible, I absolutely agree. If the plaster were to dry then the freshly melted wax would tend to wick into the investment. A wet mold would not have that problem. As soon as the plaster has completed its heat-producing chemical reactions and cools off, you can go straight to steam-out without delay.
The last item I would note is that you say you "fill the mold with glass". I may not be understanding what you describe but generally-speaking we do not recommend putting cold glass into a lost-wax mold. Instead, we use a method where a remote crucible of glass is built above the mold using an inexpensive terra-cotta flower pot. This is advantageous for a number of reasons: It allows the mold to shed its remaining water and wax residue away from the glass, reducing the potential for contamination. Secondly, it created a clean stream of molten glass that flows into an already hot mold reducing bubbles and more reliably picking-up details.
I recommend our lesson 'Lost Wax Kilncasting' which shows the whole mold-building, steam-out, and crucible casting process.:https://videos.bullseyeglass.com/videos/lost-wax-kilncasting/
Good luck and please let us know what happens!