Torque for Van's flop tube to AN833 fitting?

I am trying to attach the fuel tank flop tube to the AN833-6D bulkhead fitting by torqueing piece 1 in the picture (I think this is called an AN818 nut). I have found various torque recommendations:

AC 43-13.1b (and Van's SB06-2-23 step 17 for flop tube)
* 110-130 in-lb for AN818 nut on aluminum-alloy tubing.

FAA 8083
* 75-125 in-lb for Aluminum Nut
* 300-480 in-lb for MS28740 or equivalent End Fitting (not sure what that is)

XRP catalog (the parts Van's used for the flop tube say XRP on them)
* 110-125 in-lb for AN818 nut and aluminum flared tubing
* 210-250 in-lb for hose coupling nuts (is that what I have? Is that piece #1 in the picture?)

For choosing the correct torque, is the flop tube piece (nipple+nut) called a "hose coupling nut", "MS28740 or equivalent end fitting" or a "flared aluminum tube"? What is the correct torque?

Sources for torque values below:

Dmitry, TIGHTEN it down, then safety it. We see alot of builders get hung up on torques spec for this fitting or that fitting. We use the flats method, and the 2 stubby wrench method. Frankly, there ARE some places where you cant get a torque wrench OR adapters, or a homegrown concoction of extensions, swivels, crowsfeet, lucky charms, or voodoo dolls to torque a fitting. Ask me how I know. Some of you F1 guys know what I'm talking about.

Tom

OK, how many flats? At least this is a machined fitting, so I don't have to worry as much about the material yielding and failing (like the infamous 3003 soft tubing). But still, is 120 in-lbs, 2 flats, 6 mmmphs?

This is one more non-answer in a sea of non-answers. :/