Something sounds like it is out of alignment possibly chewing up the transmissions. Input shaft? Possibly also be a bad throw out bearing. I'm thinking alignment issue though. A FIST transmission is not something that the dealers replace every day and how good is the tech doing the work.
At least the dealer is acknowledging the issue and attempting to do something about it and not saying it is normal. I once had a 2002 Jeep Wrangler, manual transmission bought brand new with so much slop and drive line clunks- that were in the tranny- I could hear and feel it. 3 out of 4 dealers service managers stated it was "normal". The 4th agreed with me, got approval to swap it out and they put a new one in, problem gone. What a hassle though.
At least the dealer is acknowledging the issue and attempting to do something about it and not saying it is normal. I once had a 2002 Jeep Wrangler, manual transmission bought brand new with so much slop and drive line clunks- that were in the tranny- I could hear and feel it. 3 out of 4 dealers service managers stated it was "normal". The 4th agreed with me, got approval to swap it out and they put a new one in, problem gone. What a hassle though.