we've been running some pretty smooth heroic beasts encounters since we got our raid to actually make sure they are spread in the transitions. We use 6 healers and 3 tanks, one feral druid and 2 prot pallies.
For Snobolds, we have ranged and heals run into melee and everyone targets them and kills them. We normally are done with about 5 seconds left before the worms spawn, but if not we try to leave the feral druid tanking gormok while the 2 pallies bubble off the impale stacks and pick up the worms.
We have our best geared prot pally on acidmaw while all dps burn him down. The other prot pally and our feral druid trade off tanking dreadscale so that when one gets the burning bile the other taunts the boss. This frees the debuffed tank to move toward whoever has the paralytic toxin as they (usually its 7 melee) move toward him as well. After the first burrow finishes we use heroism to finish off Acidmaw and use the rest of the hero buff to get dreadscale down far. One big danger we found at this part of the fight where acidmaw and dreadscale are both up, is that when the raid is getting burning bile its easy for there to be confusion with who exactly should take that debuff to the tank with toxin. We had 3 ppl at a time running to the MT and blowing him, the melee and themselves up while trying to free him. We just had a designated person call out one person to do the running, but you could also just use the fact that the game puts raid icons on ppl with debuffs. there will always be at least a skull person so just have that person be the one who runs to the tanks.
Generally we have one more burrow and dreadscale dies shortly after coming up for the last time. Its very helpful here to remember that while dreadscale is rooted you have to be spread out but can be infront of him since he doesnt spray. This is when its dangerous for melee to be on the boss because of the risk 7 burning biles present. When the boss is mobile, spreading out doesnt matter but you cant get infront of him.
Icehowl is easymode. Tank him against the wall, make sure not to be near a wall that still has a gas cloud spreading from when dreadscale was moving about. Dps make sure to position themselves so that when icehowl does his charge thing they arent at risk to be tossed toward any remaining poison clouds. Melee dpses from the tanks position so they dont lose dps to the whirl. Heals spread out so all dont get frozen at once, and if ppl have pvp trinkets equiped they can use them if they get targeted with his breath. If the person who is actually targetted by the freezing breath uses the trinket it ends the breath and no one gets frozen. Really great for keeping dps time
As a healer in this fight id say the biggest worry on the icehowl part of the encounter is making sure to preshield or hot the raid before the boss does his charge attack. The knock back causes a large amount of damage so ppl should be topped off and hots should be ticking during the stun.
For the fight as a whole, the biggest help i saw was our healers constantly yelling at the dps to spread out spread out spread the @$% out in the worm transitions. After that it was mostly cake