Automatic life save heal and dispel would make the spell very op considering its cost. For example you could safely sit under siege fire as long as you had mutagen on. ;p Well, that is not the case. I believe it is intended.
Without the automation it is still not useless: if you are a non templar healer and don't know where the hurt ally is (party is spread out, large crowd etc.), or you want to keep someone alive despite them insisting on sitting under siege but wanting to conserve magicka.
Well, then you've made a wrong test. I admit, my testing was pre 1.6. But I don't see why they would have changed it.
*snip*
I think the mechanics of mutagen now are pretty good.It is a emergency frantic spam when you see them going down kind of heal. It would be cool if the proc would be at 25-30% though.
And there in lies my confusion......if the heal only applies to the player if they are below 20% when applied id rather go with the healing ward shield and go with rapid regen.....but if the heal gets applied to a player if they have mutagen applied THEN drop below 20% mutagen would be better.