Water can heal withstandar attack (Healing Jutsu)
Mystery attack (Regenerative Sealing Jutsu)
As passive Healing Tips (Increase Healing 40%)

Actually in Arena i can heal 1200-1300 by std attack and 1700-2000 by mys attack.
It made huge profits when my team was attacked by enemy, but in ranked, trial etc. they reduce it, when my team was attacked and has a bit of hp, i could only heal about 500-600 by std attack and 1200-1400 by mys attack. it makes a big loss.
So my question is why do they reduce the amount of healing and doesnt reduce the attack in the ranked, trial etc. ?