Some advices for my build for ng+

Hey guys

I'm currently trying to optimize my mage build to the best it can provide before going to ng+. (I plan to do all main bosses without spirit summons btw) Currently i'm level 165 with the following stats: VIG 50 MIN 38 STA 15 STR 12 DEX 20 INT 80 FAI 25 ARC 9. I'm using the Carian Regal Scepter, a Magic Misericorde with Royal Knight Resolve and on my left hand, the Golden Order Seal and the Icecrest Shield with Golden Parry. My main spells are Rock Sling, Carian Slicer, Carian Greatsword, Tera Magicka, Ranni's Dark Moon and Loretta's Mastery.
My armor is the Black Knives Set ans it's cool to be completely silent.

First of all, i've put some points into faith for Golden Vow, but is there any good buff that would suit a sorcerer?
I'm not sure which talismans to pick. Old Lord seems obvious for longer buffs, Dragoncrest Shield for more physical defense, but for the last 2 slots? Is it good to use Rotten Wing Sword talisman if i use Spinning Weapon and Carian Slicer? Radagon Icon seems useless as most of the spells i use are fast so... Maybe some means to get HP and/or FP back? (with or without crits?)
And overall, what do you think of that build? Good, lacking things, or bad?

Thanks in advance anyway