Hey, thanks for the reply!
The more thought I give it, the more I agree with focusing on offensive talents and abilities. As of now, Eder just stands in a group of mobs and never loses any health. I did some respec-testing and realized that Rapid Recovery doesn't even boost my passive healing by a whole point, so that's definitely out of here. I chose Overbearing Guard because I currently have +4 engaged enemies with talents, abilities, and items; and the prone part of the ability is nice from stopping enemies from advancing too close to my ranged characters. I'm still 50/50 on it, though.