That chart isn't over time, it's CC break point for whatever numbers were used. But CC isn't fixed; as I've been trying to explain, you don't always get the full 115% offense from the set.
This thread is entirely too long and contains much arguing:
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/178067/so-will-critical-damage-mod-sets-now-be-useless/p1
You can see my calculation for cc point is this:
1/(1.5+2p-x),
Where x is total crit damage boosts (ie, +0.42 from triangle, +0.50 from CD Up buff for a total of x=0.92), and p is the amount of offense added from mods and gear as a percentage of base offense. You can split this up into (z+y/b) where z is total mod percentage bonuses, y is flat bonuses from mods and gear, and b is base offense.
