I was opening with DoTs but I noticed that in the following rotations both Mutilate and Dancing Edge would fall off at the same time, leaving some downtime on whichever I choose to not re-apply first. (Though I suppose this is irrelevant in a raid envinroment with a WAR.) I tried different openers but like you stated, the opener doesn't have a massive impact in the grand scheme of things as long as it's not horribly messed up.

Thanks for your input though, I'll try your tips out.