Sentinels Republic

In patch 1.2 there were changes made to Carbineer's Crippling Shot- why was this nerfed?

Carbineer (along with Pikeman) is one of the most broken professions out there and it has always been a tad lackluster. Carbineer has always needed love, but why nerf one of their most powerful abilities? On live, Crippling Shot had a 7.5 damage modifier and for some reason, in patch 1.2 it was changed to a 5.0 damage modifier- why?

Still no answer- I see in the 1.3 patch notes that are currently being tested on the test server, they want to increase it from 5.0 to 5.5 but that still does not answer my question: why was this nerfed in the first place?