I'm not bringing in Vogoth for his passive heal, personally. It's a diminishing return for sure. And when CB gets to the point he can one shot Vogoth with his A1, he just will. I want to find Leech on a champ that is bringing more stuff to the table rather than a percentage of damage healing, since Warmaster procs on Leech is where the majority of our healing comes from.
Instead, I'm going for an even more defensive team:
Hotatsu is a great choice to start. In the lead slot Hotatsu increases defense by 25%, and his passive means that he can clear the stun all on his own. He also brings an Inc Def, a Continuous Heal, a Decrease Attack, and a Leech. Inc Def and Dec Atk are two of the main buffs/debuffs we need, Leech enables us to avoid using Lifesteal gear on everyone. Continuous Heal is just a nice bonus. Additionally, he can hit quite hard, and his damage does scale with his defensive ability versus CB. He'd be the first champ I'd build, and with all the different things he does, is most likely to remain on your teams for some time.
Deacon will show up with TM boosts, a Dec Def for the boss, and a backup Leech to ensure that buff stays up the entire fight. His boosting can make it a bit easier for us to go 2:1 at some points, and even if he eventually leaves CB, he keeps a spot in Arena and Tag Teams.
Jareg is an excellent champ for Ally Protection. Ally Protect is the sustain method for CB teams, defraying damage and tripling/quadrupling/quintupling our sustain. He will also continue those lovely Inc Defense debuffs, which helps our Defense champs' damage and that lovely sustain. His passive can place continuous heals on champs that take a hard stun hit.
Venomage. Poisons and Poison Explosions. Dec Atk and Dec Def. Lots of ways to put it on and keep it going with your champs.
Urogrim. More Poisons. Cleanses. Heals. Venomage blows them up, he keeps reapplying.
So basically, I don't see a need for Vogoth with this much healing, Leech, and several different sources of Dec Atk. I also don't see a need for UDK except for while we're ranking up Hotatsu. :)