The pci carrament isa special adhesive for sensitive white stones .there are other similar products I can use but I actually liked Shane the pci rep and he did me great pallet deal .the pecilastic is going to be more of a problem to replace if no one is going to bring this in.
I use it for some developers instead of ditra as it cuts costs down and also use a lot when a tile bridges over two substrates . I use bal fast flex rubber adhesive on top of pecilastic and this is as good as I can rethink of but no guarantee and the pecilastic is only 1mm thick.
for main adhesive I use tile master as posted earlier and for what I do this is far the best value for money . I think that as word spreads tile master will becomes much bigger player if they want to.