Beautiful water and trout!
I've broken out my TFO blank from its shipping tube and will start building soon. It's of the FSG type, and I don't know the significance or difference from Finesse Glass ("Finesse S Glass? Fast S Glass?).
It does bear a Lefty Kreh signature script:
The rod does seem to be fairly stiff, so I'm not surprised it's more of a 4wt. Outside dimensions at butt and winding check are smaller than my Steffen 732/3, though, so we'll see. Tip is about the same. Wall thicknesses look substantial, and that will add some stiffness.
Glad yours worked well for you in RMNP and in the Catskills.