TH Procing

[Alhanelem]

It is very clearly stated by Square-Enix, that having a higher value of TH+ equipment increases the chance to raise the TH value.



Or more simply put:

Mob TH Value = 10
THF TH value =9

Let's say the default TH proc rate is 15%
Now let's say TH Proc rate in this 10 to 9 ratio is 10%

So if you have TH+ Equipment Value of 14 then you will gain benefit of the full 15% chance to proc all the way until you reach 14. (The max proc value.)

If you have TH value total of 8 on a THF, you will have a **reduced** chance to proc above TH 8.

It is very clearly stated by SE themselves, that this is the case.

More TH will not increase the default "15%" chance, but having less than 14 will **lower** your chances to proc higher than your current value against the mob.

It is not complicated.

For Gwydion, note this part:

Adding Treasure Hunter+ via equipment, or other means, will not increase the rate at which the Treasure Hunter value grows, as this is a set rate.

Based on what Camate posted, the maximum TH proc rate is not influenced by anything: "This is a set rate."
This essentially says there is nothing else, like crit or anything, that modifies the rate. And even then the rate only changes if your TH+ isn't high enough.

You basically have your answer, and it's from an official source.