Tnxs Steve, I've tested 3 vat types till now. You can still see this in the picture above.
On the same vat:
* PolyStyreen w/o any coating
* PolyStyreen with Teflon-tape
* PolyStyreen with PDMS
Unfortunately I was not able to print on these 3 parts at the same time, because the PDMS layer was about 1.5mm higher then the others.
(I wanted to do proper testing, using same conditions on all 3 surfaces.)
Anyway, the main conclusion: all 3 vat-floors sections did work!
Although:
* PS w/o coating: was quite sticking, but it works.
(I also used glass once, without coating, but that is a bad idea!)
* PS w Teflon: is less transparent option (see middle part of vat in picture). I also accidentally partly demolished it by a knife, while getting of a wrong build.
* PS w PDMS: seems to be most easy stuff to print on. Although I later also demolished this one with a knife....

Now I changed to:
* Glass w PDMS: I guess this is a little better then PS. (PS could also scratch very easily..)
Why do you think, FEP adhesive backed tape is the best?
I also did have a look to your software, it really looks amazing!!
I'll try this as soon as possible. Many thanks for sharing!