TWF and stunning blow DC

[ThunderTank]

Is it possible to achieve a very effective DC on stunning blow, enough for running Epics ? Would it be as good as a pure barb stunning blow?
My toon is a Warforged kensai/tempest. What weapons would i need ? Does 5% weighted weapons stack when dual-wielded ?
Apreciate your help.

[Vengenance]

Strength: 18 Base +5 Level + 3 tome +6 Item +3 Exceptional +3 Ftr Str III=38 (+14 DC)
Enhancements: Dwarven Tactics III=+3 DC
Ftr. Stunning Blow IV: +4 DC
Kensai III: +3 DC
Weighted 5% Item: +10 DC

So adding this all up you can achieve:
Stunning blow = 10 base +10 weighted weapon +3 dwarven tactics +4 fighter stunning blow + 14 str +3 Kensai III=44 w/weighted item

Add in +1 for rage and another 6 for power surge and you end up with a 51 DC Stunning Blow, and if timed correctly when TWF the monster you attack has to make two saves, which means you pretty much have a no-fail stunning blow at end game on all mobs capable of being stunned.

Trip DCs are pretty close to the same or a little higher if you have improved trip. I usually run around with a vertigo 10 khopesh in one hand and a weighted 5% warhammer in the other hand.