Goundings: As i said, 1 button from drop all groundings is the way to Start.. but during the battle its nice to include them on other buttons.. I rather have my other shammys droping groundings then not doing anything on the GCD while 1 shammy is TSing.. Goundings are down in 11.5 sec CD now (4set bonus + talent) and i guess that you could be able to remeber this every like 12 sec or so.. but for myself i know that i wont remeber it before i have killed most of them and only have a mage left nuking on me and i go like "ohh.. new gouundings would be nice.. "

TS: Also the TS stacking is working yes. I have noticed the same if they goes off not exactly on the same time.. But i dont belive that its more then 2 of the TSings that are actualy stacking Kick wise... But in a small arena i cant see why you want to use 4 to throw them as far away as 1 would, since of the walls and pillers etc... But ofc.. 4 adds more DPS.. So i guess that if you are sure to be nuking them down before they get in melee range again then sure go for 4x

But again.. this is not about, If its good to drop 4 gounding or 4 TSIng... This is an additional way to keep it all up in a tacktical way. Just ignore this and go your own way for god sake. But if you found the idea to be intresting then try it out in a way of maximizing your defence rotations.