In regards to #4 this is what I do: Tag enduring, then hit it with combust as you step back and group them. Sometimes I'll throw chain into the mix just to hit all three, but Blood fire barrage should kill them all off before unstable pops and enduring will usually die first due to DOT from combust. If it looks like he won't, then use wrack to ensure he does. As a user posted before, unstable rarely pops for me unless I mess up or get hung up by environment or something I've no idea why ss isn't working for you though... Bug?
