Perry DellaValle had a nice year in the Gulf Coast League in 2018: ERA-1.97, WHIP-1.095, IP-45, SO-67, HR9-0. He skipped Peoria and is doing will at Palm Beach: ERA-2.45, WHIP-0.955, IP-25, SO-23, HR9-0.
At the lower levels of the system, Oviedo, DellaValle, and Parsons are posting pretty good stats. I just wish I knew more about them.