I ran some single simulations:
With Over-Engineered Flash Bulb, 6592 DPS: Not Available
With Kil’jaeden’s Burning Wish, 6532 DPS: Not Available
So Over-Engineered does less then 1% more DPS then Kil’jaeden with my simple testing. The stats alone on Kil’jeaden is really good. But Over-Engineered is still better to my understanding in this particular gear setup.
The devs maybe have some more answers to this.