The Sushi fest by Nature should be at your house in Cleveland so all these plumbers and tile layers along with the grout masters will all show up and fix the damn shower once and for all correctly.
Unfortunately afterwards you will have to hire a contractor to fix the rest of the house after it gets trashed by all the party animals.
Crimpie, it would seem that the best solution would be to remodel the bathroom completely.
That is going to take a bunch of bucks. You will want an architect, interior decorator, and all manner of trades to demo the existing room and install the new suite.
Coming up with the bucks might seem hard, what with losing the data you built your career on and all.
But think back a bit. History is the key. No I am not recommending that you open up a call center soliciting donations. You don't have time for that.
locker style suspense ...
Get Tim Greene on it. He should be able easily to raise the funds you need, even allowing for him keeping a bit for himself.