Discuss Advice on porcelain tile movement. Grout coming out of tiles. in the Tile Adhesive / Grout Advice area at TilersForums.com.
This area needed to be a seamless as possible and even with that unsupported edge you are going to have an unecessary step into the room!
You really have to make the decision to have the lot up and start from bare floorboards.
I hope you finally get someone good to do the work. Nobody deserves the stress you must be going through with all of this.
Reply to Advice on porcelain tile movement. Grout coming out of tiles. in the Tile Adhesive / Grout Advice area at TilersForums.com