Your Cure 2 will only be more potent than Stoneskin if cast on a non tank. Proshell is meant to be provided by a WHM, take that away then the SCH & WHM synergy balance tips. Holy is not a base conjurer skill, if taking your Magic Potency it is worst than your Circle of Scorn, and the cast time makes it impossible to cast in situation where you need multiple enemy stun. Yes Raise in combat, but can you cast it in the first place without being interrupted? Cover is a good skill but too limited usage due to the coding of the skill and most bosses having cleave attacks until they fix that Duration increase or CD reduction means nothing if cover is going to make you as squishy as the BLM you are covering and your CDs do not reduce the covered damage.

I fail to see why you would want to use Riot Blade in a solo situation, out current mana usage is either Flash or Stoneskin neither of which you'd use much in solo content. Sure giving it more damage is nice and all but Riot Blade is TP ineffective in the first place it would have to be a substantial potency increase to really replace RoH combo or unless they give it a step 3 combo.

If a paladin was made to be able to heal 75% strength of a WHM I'd dare say things will get really broken and you get to see Paladin soloing contents not meant to be solo-ed.