A Lore Bard 6/ Life Cleric 1 casting Aura of Vitality heals 2d6+5 for 10 rounds, for an average of 120 hp each casting. I believe they can do this four times a day (three 3rd level spots, 1 4th level spot), for 480 hp healed, and they still have most of their spells left. And you don't need any sage advice for this, it's right out of the book without interpretation. For a per-level comparison, a third level slot is worth 5 spell points, and a first level slot is worth 2 spell points (DMG page 287). So that's 40/2 for the first level spell or 20 hp/spell point. And it's 120/5 for the 3rd level spell or 24 hp/spell point. So the out-of-the-book spell heals more per spell point right now, without any sage advice. And yet...nobody ever complained about it.