I can think of a couple things that you may already be doing to increase efficiency.
Reduce mp usage due to healing by using status debuffs if nobody else is casting them. Slow and Paralyze are particularily usefull and should be used in every fight.
You can also use smaller heals and cast them more often. Cure1 will be more efficient for healing until your Cure2 starts healing consistantly for 90.
If a whm or rdm is using regen on people taking hits dont heal them completely to full so regen can heal for its full effect.
Rather than casting your strongest magics on an enemy use only their elemental weakness. [except during magic bursts and the use of elemental seal]
Although it is less practical at higher levels, during battle in some situations you can heal and recover one tick of mp or more between casting spells.
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| I generally go percentage wise myself, if you do this it seems like both ppl can get back to full about the same time |
Rate of MP gain while healing is not effected by the total number of MP you have. You should both recover 100mp in about the same amount of time.