I agree, the bending stress is most likely greater than the stress in the cross tube. Hopefully something was learned from all of this jibber jabber, haha.
The bars are officially complete. I got them back from heat treat last week. I wish I wouldn't taken a pic when I first got them, the bluing left from the quench made them look pretty horrid. I cleaned them up with some Muriatic acid, then shined them up with the scotch brite disc. I'm waiting on a formal shipping address for my buddy, then they'll be on the road to AZ.
Now all we can do is wait and see if they stand the test of time.
For all of the bicycle gurus out there - 800mm wide, 4" rise, 0° upsweep, 15° backsweep. 1" OD throughout.