It didn't, but I did find the other part I was missing. Terminators on the unused ports of the amp. When I capped them with proper 75 ohm terminators, it's been working great for the past 10 days without so much as a single hiccup.
http://i.imgur.com/y68qZ8I.jpg
And now WKMG is even more stronger:
http://i.imgur.com/UUzdWcQ.jpg
I hadn't realized just how important terminating unused outputs were, I thought it'd only affect 50MHz under, which is the return frequency of the amp if it was used on cable service, but apparently it had more of an impact.