I mentioned this in another thread, but a list I am really enjoying right now is:
Gold Squadron w/ ion turret, hull upgrade
Gold Squadron w/ ion turret, hull upgrade
Bandit Squadron
Bandit Squadron
Bandit Squadron
Bandit Squadron
Interesting use of a 6-ship list. Though I'm not sold on the hull upgrades.
I like the hull upgrades because the Y-wings are essential for a list like this to take on phantoms, YT-1300s, etc. Every hull point helps. However, an easy alternate to the hull upgrades is to give each Y-wing an R2 unit and upgrade the 4 Z-95s to Talas.
My first thought was to drop the Hulls and upgrade everything to PS4.
Vader as well, so that is a fair point, but ultimately it would not change the math a whole lot. Only ~58% of the crit cards (ship ones that do not immediately resolve) can be affected by R5 in the first place, so even if you slightly increase the chance of an individual damage being a crit (I used the flat 1/8), there are so many stacked conditions that the end result does not change a whole lot. A given attack needs to deliver a non-fatal crit, that crit needs to be one R5 can flip and the R5 ship needs to survive until the end of the round. These are all before you factor in the chance that you will be facing a crit-heavy squad. Maybe then you could get to .7 or .8 at a stretch, but that still leaves R5 as an inefficient use of point, albeit a minor one. When I ran my estimate, I also attached weight to the various crit cards that could be flipped, which worked in R5's favor, and he still came up short.
I'm assuming you used either the hull upgrade or the shield upgrade as a reference.. Did you include the preconditions that both of those are only worth anything if you're only EXACTLY killed, or left with 1 hull? Since you're including the preconditions that the Y wing needs to live to the end of the round, you should also include those that say the the HU made a difference.
I weighed a cancelled Direct Hit the same as Hull Upgrade for three points, so no, I did not factor in anything else. As I said, it was rough math. Also, all the R5 flippable crits were rated in reference to Y-wings.