Maybe try cure wounds???
Maybe factor in the THP from the superiority dice you are giving said fighter???
Cure wounds takes an action. Doesn't seem fair to compare it to a bonus action heal.
Also, I've been assuming 14 Cha on a fighter, which isn't free.
But sure. Your still focused on Level 1 I assume?
Second wind = 5.5+1 * 3 = 19.5
Cure Wounds = 4.5+3+3 *2 = 21
Level 2:
Second wind = 5.5+1 * 3 = 19.5
Cure Wounds = 4.5+3+3 *3 = 31.5
Preserve Life = 10 * 3 = 30
Level 3:
Second wind = 5.5+3 * 3 = 25.5
Rally = 3.5+2 * 6 battles = 33 THP.
= 58.5
Healing word = 2.5+3+3 * 4 = 34
Preserve Life = 15 * 3 = 45
Prayer of Healing = 9+3+4 * 5 targets * 2 uses = 160
= 239
I switched it to only give THP if you give up an attack at level 1. So the only way to "out heal" a life cleric, is to let the life cleric "out damage" you.
Or a better idea, since there should be a pacifist cleric option.
New Cleric Cantrip:
Words of Faith: You say a little prayer, giving a creature some minor protection from harm.
Casting Time: 1 Action
One creature within 60' who can hear you gains 1d6 + your casting modifier THP.
Higher level: Increase to 2d6 at level 5, 3d6 at level 11, and 4d6 at level 17.