[Cripsii]

For WOG:

In RET and PROT Spec:

WoG Heal = 2133 + (0.209*Spellpower)
The 2133 constant is the median of WoG base heal


In HOLY Spec:

You must add a Variable: K
K = Divinity * Conviction * (1 + Seal of Insight + Walk in Light)
=> K = 1.06 * 1.09 * (1 + 0.05 + 0.15 )

WoG Heal (Holy spec) = K * (2133 + (0.209*Spellpower))

With that you can easily get the heal of WoG:

For a Holypala :
Heal = (1.06*1.09*(1+0.05+0.15))*(2133 + (0.209*SP))

You can check the conviction buff and all other aura in the formula for better view. You also you can Get The SP var with GetSpellBonusHealing() API.

edit: If Wog is Glyphed just multiply by 1.1 => FinalHealForCustomHolyPala = 1.1*Heal
Enjoy !

Cheer !