I agree with you about the low spawns. Mobs should spawn at least as well as GMS if not better IMO.
However about taking away heal exp... you just answered your own question.
If this is true (and since I'm new I don't know if it is)... it's not just a little bit unfair, it's game-breakingly unfair. Just healing your own alt mules and gaining crazy good exp? That's insane. I've never heard of this happening in GMS, not sure why it's happening here but if it was, Arnah was absolutely correct in getting rid of it.
The fact that people have to spend more mesos on MP pots to spam-heal their own mules, doesn't matter. When you buy leech from 4th job bishops in some other servers, you pay more mesos also. Doesn't mean that buying leech from bishops is any less stupid gameplay-wise, just because the person has to spend more meso.