You don't really need stoneskin for MB if you keep the tank topped of. Except during add phase you have more than enough time to get the tank back up fast

I know this is a WHM focused thread but maybe some input for SCH:

I place my pet at around 11 oclock right of Titan on the other area with the dark brown texture. After the first Geocrush she will start floating outside the platform in relative safety.
Sacred Soil during all stomps. Virus on all second stomps (btw, better to let the SCH use Virus due to faster CD and communicate on it. Otherwise you waste your casts on immunity).
Succor before and after stomps.
Sacred Soil and succor for past heart aoe Damage.
Have Adlo on the tank focusing Titan at all times to help with MB mitigation and keep him topped of.
Eye for an eye on MT with Adds. It really helps here if you communicate and decide which healer is focusing on MT exclusively (there will most likely be a swap during that add phase, so careful there).