Lilies should be revamped.
The lily system for Whm should be revamped. The idea of using cure to proc rng lilies does not reflect the best way to play the job from a raiding perspective. In the most optimized setting, whms and Astros using Diurnal sect will rely on regen from both solo regen and their aoe regen spells and the scholar's auto heals from Embrace to keep the tank topped. If they ever manually heal, it's to use cure 2 or benefic 2 rarely. To go out of their way to cast inefficient heals to proc their lilies does not reflect how to play the job effectively.
From a supportive role, this system will help Whm function in a raid scenario. The lilies proc based on regen crits. If your regen (not medica 2) ticks crit, you have a 30% chance to proc a lily. Every lily can be used to increase the attack speed of all nearby party members and yourself. The effect stacks the more lilies you have. 2% for one lily, 5% for two lilies, 10% for 3 lilies. The duration would be 20-30sec. Basically, an aoe arrow.