A little bit off topic right away but does a tight chest strap really increase the chance of line twists? What I have experienced it doesn't.
-When the canopy pulls your shoulders up unevenly during the opening, if the chest strap is tight it doesn't tilt you on the other side as much because the connection points are more in the middle.
-If the canopy gets into linetwists, the chance that risers get uneven inside the twists is smaller if the connection points are close to each other
-Because of having the connection points close to each other, it will be a lot easier to undo the twist. (so, don't push apart the risers, it only makes it harder to kick out)
Think about if the connection point of the risers would be in the same place---> if you have line twists they will open right away (i.e. the lower the twists are the easier it is to kick out of it)
About the chest rings...as you said its one more possible point for failure or wear.