SRT8CUDA Build
Got the car on the hoist to look at the clutch. Pulled the inspection cover and the clutch disk looks OK. It is about 0.300" thick and according to McLeod a new one is 0.305-0.325" thick.
However, in thinking about the reason for increasing clutch pedal free play - if the disk was wearing prematurely, then the clutch pedal free play would be decreasing. (had to think about that!!!)
So it looks like the problem is in the hydraulic clutch master or slave cylinder somewhere. Will do more troubleshooting first, but may have to remove and disassemble the slave/master to see what I can find.