Black Mage Sanctuary - A Guide to DPS

[Galvuu]

snip

Crit still affects the crit damage, correct?
Not sure if you're accounting for that in your "napkin math" (forum math really) when trying to equate the expected value per spell of either source.
That would change the breakpoint (lowering the amount of crit needed, as not just the chance but also the crit damage is scaling with crit).

[Lodinn]

Crit still affects the crit damage, correct?

Tha's what 0.63 in the formula stands for (base 0.4 + 0.23 from crit rating).
Actual calculation is
f(crit)=(crit_chance*crit_multiplier+(1-crit_chance)*noncrit_multiplier)
damage increase is f(crit)-f(base_crit).
And increase over base value is (given noncrit_multiplier is just 1) delta_multiplier = crit_chance*crit_multiplier+(1-crit_chance) - 1 = crit_chance*(crit_multiplier-1).
Absense of explicitly coded diminishing returns makes calculations quite simple.

What MIGHT change the outcome is if i got base values wrong, i.e. if base crit multiplier is 1.5 then breakpoint indeed happens noticeably earlier.