I would drop your SS for resist in a heartbeat, SS is only usefull for extending the amount of time that your curse weapon lasts.
I'd never drop Spirit Speak on my sampire template. I'll stone off/on Parry, Anatomy and Resisting spells but no way I'd take off Spirit Speak. There's have been many times where I thought for sure I was going to take a dirt nap and Curse Weapon carried me through. It's an ace in the hole.
Sure it's nice having Magic Resistance doing some spawns but it's not mandatory. I've done all of the Felucca spawns without Magic Resist. Some spawns having Magic Resist provides very little benefit at all: Glade, Labyrinth and Bedlam.
Don't get me wrong I can definitely tell when I have Magic Resistance on and when I don't but if you know what your doing you can live without. I'll stone on Magic Resistance for Mephistus & Semindar but I've done them both without. Rikktor I'll go with parry. Neira & Barracoon I throw on Archery. Bedlam & Glade...Anatomy.
I wouldn't alter that template too much other than soul-stoning off Parry in place of Magic Resist or Anatomy on an as needed basis.
I use almost identical template but I run with 120 Tactics, 50 Chivalry, and 80 Spirit Speak.