Ryan,
Cool setup!
The Foreplay 3 inspired preamp is ready.
I will leave the Mundorf output cap for you to try, if you like it, then you can keep it. If you like more bass, let me know, I will replace it with the one that I used on my prototype.
The preamp that I will be giving you has a pair of JAN Philips preamp tubes and a Sylvania 6x5 rectifier tube. But I am sure your cleartops will sound better. Also try the RCA blackplates and the GE 6189 (with extra support rods), they sound great too!
Enjoy!