My first strategy proposition. More will come, but just so you can have an idea of what it will look like:
I'll call the Jasper Guardian "Red", the Amethyst Guardian "Purple", the Jade Guardian "Green" and the Cobalt Guardian "Blue".
Tanking:
We will need 8 tanks - 2 for each Guardian. Their melee isn't too high (about 80-100k) but their bleeding stacks will kill the pets, so we need 2 tanks per boss.
Their energy must be managed just as in a normal raid - for bosses separated at the start, then once one starts glowing he is packed with the nearest one, at 50 energy we switch with another boss... I'll take care of the switch announcements.
Quintuple last stands are to be kept for Heroism, and used whenever you want after that.
DPS:
They will damage any boss they choose as long as they do not get too high on aggro - if it happens, FD or switch boss. Not grabbing aggro is very important since it will move the boss.
Heroism will be cast near the start, once the tanks have good aggro and two bosses can be damaged.
Healing:
There shouldn't be too much raid damage, so they will dps most of the time. However, if a hunter takes unnecessary damage (we all make mistakes, but try to make as little as possible), or there is a "bad" explosion, they will need to heal the wounded back up. We shouldn't need a lot.
Abilities:
Overload: if a bad explosion happens, everyone who can must use deterrence. I believe it only reduces the damage though.
Jasper chains: the most problematic ability. Stay with the hunter you are linked with, until a jasper petrification. Note: breaking the chains deals 107K total damage during a petrification, so make sur you can afford it before breaking.
Amethyst pool: move quickly. If you are chained, don't move too far from the pool before making sure your partner has gone in the same direction.
Cobalt mine: Move away. If you have a chain, move diametrically away from the center if possible to make sure you don't kill your partner (or yourself). Break those during blue phases only if: you have no chain, and you have either master's call or the posthaste talent with disengage up, or you could die if a pool is formed beneath you while you are rooted.
Note: master's call macro (deroot):
/target {your character}
/cast master's call
/targetlastenemy
/petfollow
/petpassive
the /petfollow /petpassive is for tanks who need to move their pet to where they are.
Alternate strategy ideas:
Pack everything, and burst. There's an explosion per minute, so if everyone uses the glyph of deterrence, and the bosses last less than 3 minutes (easy with SOO gear), it should be easy.
Also, if we have only 4 tanks, we can assign 2 to each group of 2 dogs (I don't think we can assign 1 to each dog because of the bleed).