Steam wax

[osnat]

Hi
Please write your advice on the lost wax casting I did.
1. The basic model is from kind of wood
2 . I made negative mold from rtv.
3 . To the RTV mold I poured wax.
The wax is combine between Parafin and paper bee wax.
And let it cool.i must say that this bee wax is new to me , and it take more time to be cool.
4 on the wax mold i made plaster+silca mold.
Left it overnight.
5 . Steam the wax . I put the mold above boild water pot.
Until the mold is clean. In this case , it open mold so I saw it look clean from wax.
6 for the first day I dried the mold above the kiln , and then put it inside the kiln for 7 h at 93 c.
7.fill the mold with glass and began to fire .

100 93 4h
100 667 2
With kiln a little open . At around 300c , there is a lot of smoke, to much., and the top of the mold becom brown
Friend advice me to close the lied and go on.
At the end of firing the work got like a devit / haze on the top.
why it smoke so much, and how to privet it?
But why it happens , and how to privent .
I did this mold twice and it happens both.,

Thanks
Osnat