What you're doing is fine Luxania, but it sounds like you're either doing it synced, DPS + tanks are messing up and/or the other healer isn't contributing much. Odin is nothing more than a massive heal check, so if both healers aren't doing their jobs, it only results in wipes. Try and work with your other healer, as you can Stoneskin the MT between tank busters. If you have a SCH, let them focus on the tank while you can focus on the group, only giving out tank heals when needed.

For the bleeding debuff, there are 2 types: An Esunable 1 from Einherjir and the un-Esunable 1 from the Gungir lances. Esuna the Bleeding 1 from the MT, while hopefully people avoid damage and use Medica II, but only use Divine Seal for the Gungir bleeding debuff. Remember, it's not just you healing, there's one other healer as well, so it may not be your fault but the other person.