Just thinking out loud...........was wondering why the new granite walls tiles are 1" off the floor, and why the floor tiles weren't installed first?
Easy solution. Spread a bonding coat of thin set on the concrete, place the appropriate thickness of "deck mud" (sand topping mix), spread, level, and double check by placing tile and beat in. Remove tile and back butter with thin set. Set tile.
I know you're wondering what the heck I'm talking about, so look at this video. Disregard the silly parts, but you should get the idea. Come back with your questions.