i would try respeccing your resto shaman to elemental (no real gear changes needed, 500 spell dmg should be plenty) then trying 3 ele shamans in 3v3. At least try it and see how the results are. I am pretty satisfied with my results so far...

Week 1 of Season 4 i was able to hit 1502 a couple times (lol) with a mix of gear, the main had mostly S1 and S3 (S1 weapon) and the 2 slave shamans have mostly blue pvp gear (with some epic off-set items). Ended up 1483 for the week after 32 games, 15 wins 17 losses. Hoping to drive up past 1550 this week! =)

I definitely beat some teams that were totally decked out with epics, the power of 3 shamans is similar to aellies 4 shaman thing where you can kill someone before healers can react. The disadvantage of "No dedicated heals" is mitigated if you have a healing button for each character (i use 7: all 3 heal Yarr, 8: all 3 heal angelb, 9: all 3 heal angelf), this way all 3 will switch from dps to healing instantly, then back to DPS.