I don't mean to criticize or sound arrogant so keep that in mind.
my drivetrain teacher has been doing trannys, diffs, since before I was born. He has written textbooks which are standard in canada, as well as dubai on repairing drive train components. The man explained to me because i have the same attitude as you.
You CAN NOT have torque division once everything is equal. How do you justify having 100 lbs front and 100ftlbs rear to equal 200 ftlbs? why wouldnt it be 50 lbs per wheel? well torque is force, force is transmitted equally and undiminished. lets use your brakes for an example so its easier to understand. You apply your brakes with 400psi. there IS NOT 100 psi to each caliper, there is 400 PSI to each caliper as long as the fluid is contained it will DISTRIBUTE, not divied force equally.
In the case of drivetrains your container is traction. once the force(torque) is contained by mechanical linkage, crankshaft->transmission->diff's->tires the torque can not be split, divided, subtracted, or liquefied.
Im not going to further my argument, if you dont get it then o well.
u joints are GREAT! i love em! but they do break, wear out, or break other shit when its not set up properly. Im interested in this for a street vehicle so this stuff is important to me so sorry it if seems redundant to those whom dont care.
u joints are made for up to 1-3 degree max, im sure we could do more than that on the street with a 92inch shaft, I dont know to much about this but ive seen one explooood so thats why im worried