Well, I'd hoped you could stretch the mnd tests out to at least +20 (and vit needs a wider span as well), but working with what's available..

And actually, if you could redo it with a skill value that's divisible by 10 (eg: add 3 merits to take it to 430 total skill, or even full merits to take it to 440 (divisible by 20)), that would eliminate one element of uncertainty for now (whether any factors are added together before flooring).


Relative values:

Cure I and II scale at 20 skill per point of HP, so the range isn't nearly large enough to show results for mnd and vit. Ignoring them.

Cure III scales at 5 skill per HP.
Cure III scales at 9 mnd per HP. Not enough points to check for rounding.
Cure III doesn't have enough range to check for vit scale.

Cure IV scales at 5 skill per 2 HP.
Cure IV scales at 9 mnd per 2 HP. Would like a few more points of mnd checked to be certain of this.
Cure IV scales at 12 vit per 1 HP. (so either 24 or 25 vit per 2 HP)

Cure V doesn't have any skill scaling data.
Cure V scales at 10 mnd per 2 HP.
Cure V scales at 12 vit per 1 HP. (so either 24 or 25 vit per 2 HP)

Slight discrepancy between IV and V that may be related to overall scaling. Since we don't have skill-based scaling for V, can't say for sure.

Cure VI doesn't have any skill scaling data.
Cure VI scales at 10 mnd per 2 HP.
Cure VI scales at 12 vit per 1 HP. (so either 24 or 25 vit per 2 HP)

Cure VI appears to scale at the same rate as Cure V.


Overall power formula appears to be approximately:

Power = skill + mnd*5/9 + vit/5

Or, alternatively you can think of it as:
45 skill = 45 power
45 mnd = 25 power
45 vit = 9 power

So let's see if that fits with prior test results..

96 mnd + 85 vit = 53.33 + 17 = 70 power

Cure II, cap 2 = 130 cured @ 331 skill
70 + 331 = 401

Cure III, cap 2 = 260 cured @ ~231 skill
70 + 231 = 301

Cure IV, cap 2 = 520 cured @ 331 skill
70 + 331 = 401

Estimated cap 1 for Cure IV
405 HP @141 skill, scaling rate of 2 skill/HP
390 HP would be reached at 111 skill
70 + 111 = 181 power


Would guess that I'm at +1 over actual power. Not sure which element is off.


FFXIAH data:
92 mnd, 83 vit, 67 power from stats

Would then be 3 power lower than Aleste's data, and expect to reach same amount cured as Aleste's with 3 lower skill.

Code:
Skill   Cure3   Cure4
334     280     520
A331    280     520
368     286     533
A365    286     533
404     294     548
A401    294     548
424     298     556
A421    n/a     n/a
464     306     572
A461    n/a     n/a
489     311     582
A486    311     582
504     314     588
A501    314     588
Aleste's data with 3 lower skill exactly matched all instances of the FFXIAH data, aside from the skill values that Aleste doesn't have data for.