Overhealing in Titan HM is common so beware of your aggro meter. Use shroud if needed but if you're a SCH you shouldn't even be close.

What the above said ^^ but just to add - watch for the split in T1 Overhealing at the wrong time will wipe the party so Stoneskin/Adloq the OT prior to the split to save getting aggro. And keep your fairy on steady if you're a SCH at those times.