Update: Took it to the range again today, and put about 75 trouble free rounds through it. I did not clean it. I am leaning toward limp wristing as the explanation for the earlier FTE's, as the little fella kicks pretty hard.
After about 50 rounds, my new Shield 9mm had a few FTE's with UMC ammo. The gun was cleaned before taking it the range. I will try it again next time, as I could have been limp wristing it, but my XD9 has NEVER failed me over 1000+ rounds.