I DO understand how it works.
But apperently you don't as with an ability every 45sec on a 10 min fight assuming CHTC will reduce the cd of detterence by 1 min, you will be able to use the new deterrence only 6 times vs 7 times on live. (For my computation the first ability to soak is a t+45sec and the last one at t+ 585 as no boss uses a spell to soak at t+0)
If the cd of the ability is 1min it s even worse: 6 times on ptr, 10 times on live
Same if the cd is 30 sec: 6 times on ptr, 10 times on live
And if the cd if 1:30 min: 5 times on ptr, 6 times on live
How is it not a nerf.
The only upside is if you have to soak 2 abilities in less than 1 min and then nothing for 4 min (and you get your 2 charges back)