Here's my counter argument for you - I mathed this out around when 4.05 so there might still be some errors in the evaluation.
Total SCH potency over three minutes in oGCD and "HoTs" - 24,200 potency
Total WHM potency over three minutes in oGCD and HoTs - 18,668 potency
Even if you only use Excog and Lustrates as your base SCH still hits 9,800 potency in a three minute period. WHM in the same period has 8,739 potency. If you converted one Lustrate into Indom you'd lose 100 potency in single target healing 6 times over the course of three minutes, thus reducing single target potential down to 9,200 potency.
SCH still remains a beast in the single target healing department and I feel you're putting too much stock in the CDR reduction that Lilies provide considering at the highest levels of play that CDR means very little since you'll be relying primarily on your oGCDs and HoTs to get through the encounter.