if u'r behind a WHm as main tank healer... than u got something to work on... also bringing 3 healer to titan is just making the fight more open to mistake... bring one more dps it will speed up the fight and will not allow titan to stack too much stomp in the last phase (if u don't know every time titan use his stomp he do one more hit... if u take your time in that phase he will end up killing everyone with stomp... no metter how many healer u get with u... )

on the stacking SCH on the other end... yes actually double SCH really stack very bad... but at the same time with succor and adloquium as they are now stacking them will trivialize most fight... the only way to makes them stack will be to rework the spell shifting more potency to the heal component and less to the shield

example:
Adloquim; healing potency 450, generate a shield equal to half the healed amount (double the shield on crit)
Succor; healing potency 200, generate a shield equal to half the healed amount

if u do the math the amount of effective HP generated is the same as now... but with lesser shield u can't PREVENT too much dmg... u will have to use them as reactive heal rather than preentive... this will balance the stacking... but I think will also destroy the particular game play of scholar that is more based on prenventing the dmg rather than healing it...