@Woodroward
Nice output.
The only things you are missing is that you are assuming same final speed of character after equipping both sets.
As we want total damage and not only highest critical damage, the calculation is a mathematical expectation. CC*CritDmg + (1-CC)*StdDmg
As speed can vary, it will be multiplied by final speed with mods / original speed. This is because the same character being faster char will do more accumulated damage and that's what we are seeking.
In order to know the CC in with both sets do same damage we equalize the offense set with the Crit damage set.
As original speed is the same in both sides of the equation, we get:
SpeedSetOff*+ = SpeedSetCD*+
You can use this to check any different combinations of mod sets in your character, not only Offense and CD sets. Only thing you have to make sure that the first set of the equation HAS to have lower or equal final CD% than the second or you can get weird results.
The results can be:
CC<0 or CC=0
This implies second set always do more Dmg
CC>100 or CC=100
This implies the first set is always do more Dmg
0<100
This is the usual range we seek and tells us what's the CC in which both sets do same damage.(the point crossing lines in the graph)
If base+mods+lead+uniques CC of the character is higher than this number, then second set does more damage. If not, fist set is better.
(Second mod set of the equation has to have a higher or equal Crit damage for this to be true)
It is a bit more complicated than the useful simplified calcs you provided and those will do if speed do not differ much between each set of mods.
