I would strongly suggest adding 30-50 RES, for grub control. Snails always appear sooner or later, and the RES do a good job controlling the parasite's host (snails). RES can grow nicely, only spawn one a year, and taste great after a strong fight on a line.
If using an automatic feeder, and the likelihood of frequent water flushing, you can stock a lot more fish than you realize.
A bottom draw siphon could also improve water quality, AND reduce the chance of the dam being topped and/or breached.
