how funny- I just bumped your construction thread- any updated pics we could see?

You paid for Walker Zanger tile in the first place. Is there any way you can send them the tile and have them lay it out again and paper the front for you? After all, the paint has been removed and the tile is intact. I understand that you're keeping the same installers in part because they are picking up the tab for replacement tile, but if you can salvage the WZ at this point, maybe you should have someone else install it. Cheating indeed. Jeesh.

Important - glass tile is not created equally. You MUST use the manufacturers recommended setting material. If the glass has a paper backing for color the alkali in the thinset could deteriorate it. Results are very ugly. Takes a while before it shows up. Just because the bag states glass tile mortar does not mean it applies to all. Some glass requires use of mastic therefore it can't be used in a shower. Some allow the use of epoxy grouts & adhesives others do not. Some recommend waterproofing/crack isolation membranes some no. You may not be able to use whatever tile you want. Do the research as I'm sure others have done :) Unfortunately the majority of installers won't. Do not let the manufacturer tell you to follow TCNA guidelines as they specifically state to check with manufacturer. The preceding was a consumer alert:)

Tile should have been set prior to plastering. The plaster is not meant to allow tile to bond. So yes, can compromise the finish.