So I've found a good healing pet goes a long ways for solo/small groups leveling. Best charm pets I've found so far are the grove nymphs in Salisbury, and the keltoi visionary. When you or a group-mate get below 50% they will cast a large heal. Makes soloing a breeze, you can attack with them but when someone is getting below 50%, put the pet on passive. May seem pretty obvious, but I found it super helpful. I believe it's working as intended.
Also I'm wondering if anyone has found a healer pet in Tepok, can't seem to find much information on it. If anyone would like to list some good pets, maybe we can help each other out.