Ну блин. Вы куда смотрите когда изучаете источники инфы?
https://github.com/TrinityCore/TrinityCore/issues/6268
WoWWiki value is 0.286 and 1.88 is the generic healing scale, so:
Coef: 0.286 * 1.88 = 0.5376
DrDamage r1426
["Name"] = "Earth Shield",
[0] = { School = { "Nature", "Healing", }, canCrit = true, sHits = 6, SPBonus = 3.228, NoDPS = true, NoDoom = true, NoPeriod = true, Downrank = 9 },
Coef: SPBonus/sHits = 3.228 / 6 = 0.538
Rawr v53352 (latest version for 3.3.5)
float ESBonusHealing = stats.SpellPower; // ES bonus healing = spell power
ESBonusHealing *= 1.88f * (1f / 3.5f); // ... * generic healing scale * HoT scale
Coef: 1.88 * (1 / 3.5) = 0.5371
Теперь смотрим имеющиеся данные.
2971*0,538+337 = 1935