I'll update this thread with info from my experience, in case someone has the same issue(s):
As I described a few posts up, my truck had a very intermittent misfire only when warm. I could "cancel" or "hide" the misfire by pushing the brake pedal, turning the steering wheel or turning on the A/C.
I took Mike's advice, pulled the injectors to have them pop tested and flow matched. I dropped them off at a local injection specialist at 8AM, I got a call at 9:15 that they are all leaking. I bought a set of stock replacements and installed them, and did a valve adjustment. And just like that, my truck runs like a top!
Thanks again for the reply, Mike!