The Healer's Handbook player companion has some lovely new things for Oradins.

The Pei Zin Practitioner oracle archetype that trades out its 1st level revelation for Lay on Hands, so you can now be a single-class oradin! You can only use it 1 + cha mod times per day, though, and don't get more uses per day as you level up.

The Envoy of Healing trait (Religion, Sarenrae) lets you reroll die rolls that come up as nat 1s on channel energy, fervor, and lay on hands. That's an average increase of 0.5 HP per die.

There's a new 6th level mercy called Targeted. Your Lay on Hands also casts the sanctuary spell on your target with a DC that scales with your level.

9th level mercy, Injured, gives 3 fast healing for 1/2 level rounds.

Paladins can trade out their Divine Bond for an Agathion Bond that increases their healing by their cha mod, and more as they level up.