Update is this. Topps manager took photos and samples. I chased yesterday for the BAL local tech and was told he would take his own samples and photos making the Topps visit a waste of time. The BAL visit is now monday.
I have mixed 2 samples from the grout bag as described previously. The first was mixed as per my usual method and placed on a scrap tile to dry. The second was mixed as per the bag instructions at 5:1 ratio by weight. It looked exactly like the first mix and was spread on to the same tile. A couple of days later and tested by a wet finger, both samples are acting the same as the grouted tiles, softening and smearing when rubbed wet.
Monday will be a week gone since I raised the problem. We needed this shower operational so I could start on the other bathroom which is now being held up. Pain.