Hello Kovachut,
Thanks for the detailed answer. In any case SR should be active before anything else, obviously.
My question lacks context, as I am playing PVP now. It seems I have to avoid procs from tailoring, ring, enchant, at all cost.
Maybe even NOT PLAY with the Shred Glyph at all. (SR + Rip + Berzerk)
Because this impossibility to refresh Rip once it has landed got me killed in arena some times, just because the spell was actionable.
(It has 1-2 sec left on target, you cannot apply it & two seconds later it's it CC chain time).
So the issue I encounter is more of a play style issue rather than about the damage.
I really find it lack flexibility since with rake you don't have this problem. I cannot see playing without the Shred Glyph at the time, so maybe I'll chose not to apply SR the first time around, so to be able to gain the possibility to refresh it the 2nd time around, this time with SR.
In my opinion this over complicates cat.

