Quote Originally Posted by Shirobi View Post
Using /stopcast at the beginning of a macro can be a substantial DPS increase over a moving or jumping to clip cast times or hit procs.
Macros in this game don't work like that, your stopcast and bloodletter would try to execute at the same time. See any thread about dps macros and why they are bad.

Also, DoT ticks on the 3 second timer server-side, procs happen on that timer. There is no reason to cancel a 1.5s cast to use a proc.