Phylactery +2d6
Band of Charisma
Extra Channeling feat
Happy heals.
You got conned. You're making an expensive investment in both items and a feat when for out-of-combat healing all you really need is a Wand of Cure Light Wounds (750gp -> 50 uses).
Im not arguing that you cannot make Harrim into a decent healer but his 10 charisma score is his biggest weakness considering wisdom and charisma are the most important stats for cleric. With + 6 charisma band and extra channeling feat he is at same level as Tristian without gear. Also considering those same items with Tristian heals are even much more happier. I had biggest problems with healing at the start of the game (hard) when money was very limited and charisma gear + phylactery was not available (ghost guy dropped this I think at witch swamp so its quite early). Chapter 3+ money is not a problem to buy all the potions and scrolls so middle / late game its more about buffs / removing debuffs and debuffing enemy and I dont think there is a big difference between Tristian and Harrim regarding those areas.
Charisma is a giant trap for Clerics. The
only thing it's used for is Channel Energy and if all you want are heals, just get the Wand of Cure Light Wounds and you're set; it's a much better option than spending precious point buy on
charisma of all things. Charisma is the stat you should always dump to 7 or lower (ie. Dwarf) to save on points unless you're playing a Bard, Paladin, Sorcerer, Eldritch Scion Magus, or Feyspeaker Druid because charisma does not matter. Those points could've been much better spent on stats like constitution, dexterity, or wisdom.