Unless they changed it (I haven't logged into my shaman since 2.2 I think), the wf totem buff lasts 10 seconds. So wf totem for like 1 sec then grounding. In a 5s arena, I guarantee that your grounding will be gone in less than 3 seconds of u dropping it then just move back to wf totem, sometimes sooner esp if u have a good shaman that watches for specific casts to ground -- e.g. poly's or CL's. Most of the time, you don't need to even use max rank wf totem either since the extra AP is nice, but not essential if mana is a concern (which it shouldn't be with how great water shield is now).

79 hit rating without any hit talent for specials. Some obscenely large number for white hits that PvPers usually don't care that much about (350 or so?).