I believe the % of crit u gain through Tidal Mastery doesnt show on any school on your character sheet.
(i recon this is because it only effects healing and lightning spells unlike Blessing of Eternals and Thundering Strikes)
I almost certain it doesnt show so my sheet currently shows i have 21.6% crit i actually have 26.6% on healing spells dont i?
(just looking for confirmation)