xenon total dmg vs attack

1 %ATT = (100% + %Boss + %Total damage) / (100% + %ATT) %Boss

Keep in mind, if you are using this simplified formula, that this relates an ADDITIONAL +%ATT = +%DMG comparison, and is not representative of your CURRENT equivalence for %ATT and %DMG. If you are comparing two different sets of potential, you must subtract the existing %ATT and/or %DMG on that item.

And to generalize, at the later stages of bossing, Xenons are not required to have a single %Ignore line in their potential (when using Snipe), as they receive a fair amount from skills and guardbreak hyper. A single line of %Boss or %ATT at legendary will usually surmount a single line of %Ignore for targets with 0-100% PDR, though obviously this will differ for each individual. Only you will know what is best for your character.