Hello!
I wonder which adhesive you use when tiling.
I've been using PFK+ Schönox, but it doesn't "hold" well enough to start in the middle of the wall (25x40 tiles).
Instead, I have to start by shimming up the bottom row, and it feels like it takes significantly more time and is harder to get exactly level. I don't want to bring along crooked tiles that disturb the rows above.