Now we cooking with oil!! Finally some data to interpret !!
WHM
Cure II potency is 700.
Also in row 49 you have a typo, your cure potency went down with largesse.
I know both Benediction and Divine Benison have no "potency", but what is your normalization practice for those? For example your Benny has normalized at 1300; but 1300 potency heal couldn't heal a tank from 1% to 100%. Similar with DB it's effect scales with HP and not potency so it depends who you're using it on.
Lets take a tank at 40k ehp (ilv270 tank stance), and we're healing with a ilv 270 set of gear. current 400 potency Cure = 5500 hp. 40k/5.5= 7.27 Cures; 7.27*400 potency= 2908 effective potency (healing 40k ehp).
note: benedictions effective potency scales up the lower the healer's ilv.
Likewise with DB, 15% of 40k is 6k. Using current Cure at ilv270 to normalize, we get 6k/5.5k= 1.091 *Cure = 1.091*400 potency= 436 potency
(I know this is a bit off topic but look how weak a 15% shield is on a tank with 40k!! HP ....but we crying about losing a 10% shield used on a nominal party member with half the max HP...
)