i think that rigging own weight in DdRT on FC is different than lowering a load. i think the differences are beyond the double loading potential; but also the tight bight is more tolerated in DdRT; by virtue of not all the force cranking around the tight bight to lower. If we use 2 separate lines to support and lengthen 1; the force shifts to the more static/non moving line. i think similair happens in the DdRT somewhat. This is why the hitch slides; be cause it can unload.
So, i'd be more cautious about lowering through the tight bight of the double rings. The rings have a fair amount of friction; so of course the support loading would be less than 2x.
The reduction in loading by the spread angle is determined by the cosine of the angle, of each leg from inline. Inline being Zer0 deflection. This contincues until 120/each leg at 60; for the cosine of each leg is .5; so each leg has loaded force x .5; or .5 + .5 for a support load matching the load. Past this however, the cosine keeps reducing; so that instead of the 'end(s) having leverage over the bend'; we have an inversion of the 'bend having leverage over the end(s)'.
So, if we want to play with power and have a higher return than effort; we pull an end (with other end anchored) and take an output on load at the bend if less than 120/60 degrees deflection each. But, if the angle is greater than 120; we would input effort at the bend; and take a leveraged output of force on load on an end (with the other one anchored). The former is our 2/1 lifts, or forces on a redirect. The latter, though less realized is much more powerful a return potential; and is used in sweating/swigging lines; and in the bends on Standing Parts.
For the latter to work; the line must resist bending. For just like placing perpendicular force on a lever, the more the bending is resisted, the more return. So, the line has to be pre-tightend; then bent. We can even pre-tighten a line, then place a bending line perpendicular to it; that doesn't bend the original line (becasue it is so tight). Then, Place a bending line, on the bending line (i say make a T bar). Then we bend the last line, that bends the next line, that bends the original load line; each tier leveraging it's force into the next, for sum real power.
