I play a little whm myself sometime, I think crit CureII are really strong, and can be as helpful as crit Adlo in times. Yes I'm aware that 90% of the whms dont like crit, but frankly I dont trust 95% of the whms in this game, and I trust myself and our static whm.
Also by the way, double-shielding effect only applies to Adlo, not to Succor. Maybe it's better to learn your stuff better before u come here and teach other people?