This boss isn't overtuned at all, I ran this one as my first ever heroic with a load of freshly dung 50s, you just need to pay attention to his abilities.
In addition to the little shield he puts up, he also gets a shield droid, if you smack him when he has that up, he'll smack you right back and one shot you. He's not randomly changing targets, they're just triggering his retaliate due to the shield droid.
Me and my buddies will be posting video guides for all of the heroic FPs over the next week or two, but none of the heroic FP bosses are overtuned.