383 on PoD vs 360 on carian regal. carian regal scaling is a probably mostly accurate estimate based on what it will upgrade to at +10 (it's +9 now.) i can get PoD to 405 if i am feeling particularly masochistic and use marika's soreseal to put me in negative damage absorption (radagon's is permanently fused to talisman slot #1 by necessity). not sure where the discrepancy is between your scaling and mine

i forget about the carian weapon art being so good. i have seen a lot of folks dual wielding staves in co-op. if you ever get to the point where PoD is better you can right hand PoD and left hand carian for the weapon art (two-handed) and moon sorcery bonus