The wiki says that rocket puppies deal normal, elemental, and fire. Unless testing shows otherwise, it is reasonable to assume that all non-turret enemies deal evenly split damage beyond T2. Now, I personally believe that this is not the case, and I think that heavy enemies (and your rocket puppies) might actually deal unevenly split damage (if not outright pure normal), but I can't prove it yet. I am simply working with what the community has recorded on the wiki and forums.

Still, I have edited my response to include your objections. I think there is some merit to them.

I agree. Grey Owlite's defenses are among the most important in a shield, so it will carry value no matter where you take it. The only other shield I would speak just as highly of would be the Crest of Almire, which not only defends against the two most important statuses, but against the deadliest damage type, as well (if not the most common and annoying type, elemental, which Owlite is great for). But the Crest takes a lot of farming and patience to acquire, so you might as well get GOS in the meantime.

Looking at your loadout again, I'm tempted to think that an Argent Peacemaker would suit your arsenal better. Your gear seems to be swordsman-oriented, and the AP is the perfect sidearm for one.