The Superior Soul

[Matuse]

1. Which passive past life feats would benefit this build the most:
- The passive 5% healing amp from Paladin past life would be nice for the free heals.
- +1 to Evocation DC's from sorcerer
I'm currently 20 FvS, thinking of going a different class 2nd life and 3rd life FvS again. Or would it be better to just go Fvs -> Fvs -> Fvs?

It really depends on just how many lives you're looking to do, and how much focus you want.

Nearly all past lives are useful to the build.
Wizard: Spell pen - Destruction, Implosion
FvS: Spell pen (as above), SP
Sorc: +Evoc DCs (BB, Implosion), SP
Barb: HP, everyone needs that.
Fighter: +tohit
Monk: +damage
Rogue: +sneak attack
Paladin: Healing amp
Ranger: Stacking resists (on top of FvS stacking resists)

It's really only Clerics and Bards that don't offer much in the way of past life benefits...Cleric only helps when using heal spells against undead, and Bard doesn't do much at all.

2. With the changes to disruption in u9, would a triple pos longsword in offhand be viable (holy/goodburst/30% healing amp)?

Greater disruption becomes pretty awe inspiring vs undead, at 6d6 per hit, plus the chance to disrupt. You could go with the healing amp, or the good blast.

I wouldn't go overboard on healing amp when you are your own healer though. You'll already be able to pick up the first rank of human recovery pretty cheap. Biggest benefit would be using the SovHost capstone on yourself for significant numbers (max+empower+ potency and it only hits about 50-60). May as well go crazy and make a downtime item for yourself, and go with all 3 tiers of healing amp :P