I would like your opinion:

This happens after a few sessions tracking my stock 2007 997.1 Carrera S.
The clutch pedal sticks to the floor when going to 1st or Reverse upon leaving the paddock or leaving the raceway. I have to lift the clutch with the tip of my left foot to get it off the floor.

This only happens after a few sessions of track (Thunderhill, Sonoma, Laguna Seca).
Not in traffic.
Not when cold.
It would spontaneously go away after several miles on the highway ( usually it's heavy traffic from Laguna Seca or Sonoma).

I have 26,000 miles on my stock engine.
More than 10 track days.
3rd radiator..
.5 extended oil pan.
I have a slow leak from trans (RMS?) ~ 1 drop a week or less.
I rarely add oil even after a track day (use Motul or JoeGibbs).
I use those pricey Castrol brake fluid & have GT3 air ducts which have lessened the frequency & severity of the problem but it still occurs.

Any ideas?

Yes we can do custom spring rate selection. Best to email or call me with your intended usage and setup so that I can provide you with what I have experienced to work best for your specific application.
Tel: 410-799-7223 Email: tchan@tpcracing.com