I'm feeling mathy, but I can't get on the test server, keep getting a weird error. If anyone can supply more data, it would be great. The following would be interesting to know:
  • WHM1 to determine a low cap, if one exists
  • Test with different, mid-range (300~400) healing skills with same MND/VIT
  • High skill test (400~500) with same MND/VIT as the previous test, to see if there's a different formula based on tiers
  • Max skill test (500+), to see if there's a cutoff at some point
  • Different MND or VIT (not both), to determine the effect each of them has, all performed with the same skill (Atma should be a good way to get lots of one specific attribute)
  • Brew test, to see if there's any cap for MND or VIT

All of those should be performed using Cure IV (since I suspect other cures follow the same formula only with different base values and Cure IV is the highest, so rounding errors are lower), preferably without any Cure Potency gear. Abyssea - Empyreal Paradox would be a great place to do it, MM Atma for constant Refresh with HP cruor buff, which can be canceled to get into low HP. (Do you have access to all Abyssea abyssites on the test server?) Could also use cruor buffs to get MND and VIT increases seperately. Just have to pay attention that the Atma you equip don't have an additional effect that may interfere with the testing. Would be great if anyone could provide those numbers, even just partially.