OK, well Xeca is my student. I showed him Shattersoul on my sch. Since then I have been perfecting it.
First off, while Plenitas Virga may be the best staff for monk and melee jobs and some mages, but it is not the best for SCH. The best for sch by a big difference is
Urduja. I also stack in some other double attack gear such as grip, and earring So I have a total of +16 double attack.
For back I use
potentia cape
Second, I can't even believe you would equip a WS gorget for shattersoul. You gimp yourself so hard. WS gorgets only proc on the first hit of a weaponskill. So please toss that.
First off, no one gorget or belt is going to give a better boost than another as long as it is aligned with the skillchain properties of that weaponskill. For something like Shattersoul, which has Gravitation and Induration properties, equipping a Soil Gorget and a Snow Belt would be the exact same as equipping a Shadow Gorget and Shadow Belt as far how it'd affect the weaponskill. Any pairing of belt and gorget associated with those three elements would do the same.
That being said, since Shattersoul doesn't mirror fTP throughout all its hits, the gorget and belt will only affect the first hit, so using high Int and combination Str and Int will do you better. Something like Wanion Belt will be the absolute best right now for Shattersoul due to the 8 Str and 8 Int it offers.
I have both and competed with others using Plenitas Virga. They fail everytime. I have also used it on many T3 VW and out dmg emp users of many jobs. I will say a few sams and rng's out dmg me but not all. And the wars do fall behind with their emps. Relic drk great swords are ahead.
So what do I use pre June update:
Aife Medal
Another interesting piece I use that you may want to look into. Keep n mind I am a sch, but war can use it. For your head
Khthonios helm will work wonders.
What makes sch so good?
Sch can do anywhere from 4k to 15k+ on things from Ep to VW t3's and I yet to be buffed by a cor or brd.
But JA immanence, Luminhelix, JA Immanence "stone 1-5" 1 for exp 5 for NM's. makes distortion. Sch can shattersoul after this to close darkness.
The darkness will do 1.5x the dmg of the WS. So 90% of all abby mobs I one shot.
Some other numbers. 9k WS/sc seps.
14k WS/SC ironclads
8k Rani
VW
t3 Sandy 6800
t3 VW kirlin 8800
There have been others. In aby: I do use sea daghter atma, as I heal the weak or set up SC so I dont ever melee a monster before it is one shotted.
To sub, /drk.
Absorb INT will give you the +20 that PW staff has and you can Absorb mind for better healing. STR/DEX same.
Absorb TP for more SC's weaponbash and stun both help on stuns. and JT attack bonus from drk is nice.
DRk also gets the new JA's as well as sch for casting magic to get TP.
Occult Acumen
And JT
"Magic burst bonus" This is where i pop off a drain for 500-1100. Or 1300-1700 MB
Last resort up every 3/5 minutes is very nice as well. You don't have to bother with souleater.
My sch inside aby usually is walking around with 800 attack.
I concider sch a battle mage and its lots of fun. Few jobs can keep up and many people like what can be done with sch now.
On a side note that self SC takes 1:30 worth of wait time to get both charges back. 2/5. In general I get one charge back on way to next mob or while casting regen 5 to make it so mobs can't hurt me.
So every now and then I will just do 2 shattersouls to get all charges back and not SC a mob. Vs a sam three minutes mediate :)
To me I can set up the skillchain from afar. So then mob reaches me I just ws and run away and it dies. Their is no TPing for me or the monster to gain tp to use a move on me.
As for being MP efficent for dmg. Luminhelix is 28 mp, stone one is 7. So 35 MP is fast and efficent when concidering how much dmg it does with the SC bonus. It would beat out most MaB gear sets.
Some side notes, the spell stun won't always give you long enough to cast regen 5 when dark arts is up, but weaponbash seems to stun longer and the spell almost always gets off.
For Exp, Atmas MM sea daughter and cosmos. Cosmos s for two hour. So I one shot everything for two minutes at worm camp.
For NM VV +50 str + 2 regain + 10% DA to add to the 16% you have. atma or Kirln +40 int seems to do well.
Their maybe better combos like smiting blow "damage increase for two handed ws's or endless nightmare, but I not had enough time to test them all.
As I never had a bard or cor buff me, I don't know what I would ask. But i do eat yellow cury buns for fun sometimes, but not always.