Off the top of my head...
1. Get Healing Lorecall added to your spell list somehow; this increases the usefulness of your Cure X Spells by a bit (they remove a couple of extra status conditions, which saves your important, higher level spell slots for better stuff).
2. Augment Healing and Magic of the Land both add +2 HP healed per spell level, each; 14 HP/Spell Level for Heal and Mass Heal is a bit better, I think.
3. Imbued Healing plus a Domain gained somehow (Planar Touchstone (That one place that gives a Domain) is a choice, as is Contemplative)) is nice, as you can dump a slight buff onto your healing spells.
4. Screw it, let us multiclass; dip into Bard, with the Healing Hymn ACF, to add your ranks in Perform to the amount healed.
Cure Light Wounds, Mass, from a Healer 19/Healing Hymn Bard 1 with 23 ranks in Heal and Perform, would heal 1d8+66+Charisma Modifier, remove one of the following: dazed, dazzled, fatigued, exhausted, nauseated, or sickened, and would apply a buff based of what Domain they grabbed... to 23 different people.
Seriously, it makes Cure Minor Wounds more effective; I would like to drop a Cantrip that heals 3+your ranks in Perform+your Charisma modifier, removes a status ailment, and buffs an ally, thank you very much.