3505.680024      8  Rogue / 6 Ranger / 6 Fighter
3504.480036      12 Fighter / 6 Ranger / 2 Rogue
3409.64448           20 Fighter
3631.772529      20 rogue
3654.198754      20 ranger


Equation used before unique class stats:

[(weapon dice + damage modifier)*(1 + Power/100)*C + (SA)*(1 + 1.5Power/100)]*(3+Doubleshot)

C is critical multiplier (e.x., 1.95 for a tier 5 kensai, with the 11AP core, in blitz)

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EQUATION with general gear, destiny, etc. input

[((55.4 + ((62+INTBONUS-10)/4) + ((48+INTBONUS-10)/2)+DAMAGE)*(100 + Power)/100)*C + (SA+49)*(100 + 1.5Power)/100]*(3.23+D)

55.4 is weapon dice + advancing blows + deadly + clawset.
62 is intscore with LGS KTA stick equipped
Intbonus is the int received from enhancements and feats particular to the build.
48 is intscore without KTA stick. (Claw is worth more than an int-cloak with 14, or helmet. Only augs used.)
DAMAGE is damage received from Favored enemy, Feats, and Enhancements.

49 is SA from gear
3.23 is Doubleshot before Feats and etc:
9 pl + 4 neck + 8 quiver + 2 ship buff

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Assumptions and Simplifications

Calculation was done with optimal gear set-up. [See last post]
No fort target. (The builds are obviously roughly equal in fort bypass but not the ability to remove sneak-attack immunity.)
No clickies (e.x, sniper shot or good death).
Assuming all killer procs were up.
Assuming all precise shot stacks were up.
Full blitz.
No respect to seeker.
Needle was used.
Harbinger of Chaos was not included.
Weapon Procs were not included.

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Conclusion

8 rogue, 6 ranger, 6 fighter has the most potential since it has Manyshot, Damage Clickies, and Assassin's Trick, whilst only being 100 dps (or a standard deviation) behind pure rogues and rangers.

Enhancements      Total      80
     Harper      8
     Mechanic      41
     Assassin      23
     Human      5
     Thief acrobat      3
           
Feats            
1      Point Blank shot      
1H      Precise Shot      
3      Precision      
6      Rapid Reload      
9      Rapid Shot      
12      Quick Draw      
15      Improved Critical: Ranged      
18      Improved Precise Shot      
18      Improved Precise Shot      
21      OC      
24      Combat Archery      
26      Silver Weapons      
27      Epic Sneak Attack      
28      Doubleshot (10%)      
29      Harbinger of Chaos      
30      Active Past life: Rogue      
30L      Sneak Attack Feat      

Enhancements      Total      78
     Harper      13
     Human      3
     Kensai      36
     Deepwood      25
     Mechanic      1
Feats            
1      Light Repeater Prof      
1H      Point Blank shot      
2R      Rapid Shot      
3      Precision      
4R      Precise Shot      
6      Completionist      
6R      Manyshot      
7 (1F)      Rapid Reload      
8 (2F)      Weapon Focus: Ranged      
9      Improved Critical: Ranged      
10 (4F)      Improved Precise Shot      
12      Completionist      
12 (6F)      Weapon Specialization      
14 (8F)      Greater Weapon Focus: Ranged      
15      Greater Weapon Specialization      
16 (10F)      P      
18      Toughness      
18 (12F)      P      
21      OC      
24      Combat Archery      
26      Silver Weapons      
27      Epic Toughness      
28      Doubleshot (10%)      
29      Harbinger of Chaos      
30      Active Past life: Rogue      
30L      Sneak Attack Feat      

Epic Halyconia
Mentaus
u31 ring
u31 belt
u29 necklace
LGS hide cloak
Claw gloves
Claw bracers
U29 Armor
Blessed Boots
Avithoul Ring
Epic Litany
Epic Quiver