Well, I think they are going to hand you your head on a platter.
Mainly because a switch to 9
MC may not be an improvement from their perspective

.
The key thing for the above list is that you have serious fast threats in the scarabs, which would be greatly reduced if they kill the scarabs - that's not that difficult to do, even with the new
FAQ. Also, you have no invul saves on the Spyders and particularly Draigo wing will hurt.
I used to swear by the
CCB, but in 6th I've found it is ok, but not great - and in this list it is screaming to be shot first - in which case you'll lose First Blood, probably closely followed by Warlord.
So, as you have 6 wraiths, I suggest you swap a set of spyders and scarabs for a wraith unit. I also suggest you swap the OLord for a
DLord instead (to go with the wraiths).
Now for your 350 extra, you are pretty much limited to Elite slots, or a royal court. You don't really need more troops
imho.
So, another
DLord and Praetorians? Fits the fast theme, but value of Praets is widely debated.
You could add deathmarks in a Scythe (ie OLord,
MSS,
SW,
WS, DespairTek, Scythe, Deathmarks for 355 (drop one gloom prism?). Or, Drop the scythe and use the points to add a veil, shroud plus a StormTek. Start the unit on the table, T1 veil, shoot, then shroud a different unit (someone told me that's ok because shroud is not a shooting attack?).
hth in some form