aether barrage suggestions?

70% standard monster health with a debuff
100% standard monster health with overcharge.

@100% Accuracy: Level 20: ~250 modulation damage wanted
10d8+ 1/3 untyped FCB (+6) = Average 51/pulse @20th	= 153
>Would be exact number with five pulses

If: +DEX with values as per your table: 57/pulse @20th = 171
If: no +DEX but Deadly Aim +8@20th allowed: 59/pulse = 177
If: +DEX & Deadly Aim: 65/pulse = 195
If: +DEX & 4th shot at BAB11+ =228
If: +DA & 4 shots = 236
If: +DEX & DA & 4 shots = 260. Bit too much?

If accuracy is an issue, skirmisher and barrage pulses are currently the least 'equipped' due to not needing a weapon of some kind. Something similar to soulknife Crystalline focus items?
51/pulse +Dex(6@20th) +3 = 60. 4 pulses = 240 (256 for a 1/2 FCB type)  would be right in the ballpark?

Possible fun combos if you don't want to go the deadly aim route (probably best suited to just dex and a focus item)
Aether Infusion + Barrage III + Light Show
When you spend a full-round action on charging Aether Infusion, you may instead create a single Barrage Orb. This orb acts as a Dancing Light but must remain within 10ft of you. The next time you use the Aether Barrage shape, the orb discharges towards the same target as one of the pulses, using the same attack roll but its own location for purposes of range and total cover*. This additional orb deals half the damage of a regular pulse, including any extra damage in this case. The extra pulses cannot be empowered
At BAB 11 and 16 you may create a second and third orb, using additional charging actions as required. Each is slaved to a different barrage pulse.

*so one or the other might bounce off cover, you can use it as an extra 10-15ft max reach, or it may instead fall just a bit short because it was behind you.

Aether Skirmisher + Barrage IV
When using Aether Skirmish, You may instead use Aether Barrage as a standard action. Doing so reduces the number of pulses fired by 1. A Skirmisher Barrage does not multiply its damage as would a shapeless blast.

Aether Focus: A Skirmisher Barrage (standard action) is compatible with Aether Focus. If you instead use Barrage as a Full-Round Action, you instead create Orbs at the end of the round if you maintained concentration, as if you spent an action preparing Barrage Orbs