Best power focus for Jack

Pro Jack users, What's the better power focus for Jack. I typically use crit rating but is Jack better with higher crit damage rating. His description says attack effects damage is based on his crit damage rating or something like that.
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Should be some option where you can set your DEFAULT that you want to use for all your 7* champs, and only if you go in manually to specific champs then you could apply something different for just those other champs.
In the Focus selection screens, there could be a “SET AS MY DEFAULT” button (would have to set on both Offense Focus Screen, and Defense Focus Screen).
Doing that (while you are setting them for some champ anyways), would then carry-over to all FUTURE champs you pull.
But wait, there's more.. OK, only if they want to do some extra work to the GUI. (But just doing the single button above would be a good start.)
Another button next to it could be for “APPLY TO ALL”, would make that Offense or Defense Focus the current focus for ALL of your champs.
And of course, a middle ground 3rd (potential) button that would be “RESET THIS CHAMP TO MY CURRENT DEFAULTS”.