Basically they would heal for a whole bunch and then do damage to you after a certain period.
What I was thinking is to do an initial large heal, then have a DoT component and an HoT component at the same time, with the heal part lasting less time.
So for example it would heal for 100 using Restore Health & Conditions (about 2/3rds more than a super) and then have a Restore Health for 20 going on at the same time as a Damage Health for 20. The Restore Health would last for 1min and the damage health would last for 62 seconds, end result is after 1min it takes 30 health off the player, essentially making the ultra as good as a super with the addition of it "loaning" you 40 more HP and no debuff.
Is that the best way?