You imply solo levelling, so plants are pretty good. For soloing you need mobs that don't do a lot of damage, move slowly or stay still. Since your melee is already pretty high you will have enough HP that you don't neccessarily need a team.
Elemental
Stingas in Dew Drops by the Karavan Teleport, then move to Fount.
Shooki in Ofvlaks Oasis North of the Waterbreakers camp above the cliffs.
Psykopla by Min-Cho South exit, a favourite spot for many people.
Cratchas near Zora or Matis
Cratchas in Void for when you get higher level.
All the plants will destroy jewels and armour so be prepared to replace.
I would be careful of Timari as they seem to have a high magic resistance.
Unless you are in a team, avoid Kipee. They move fast and their stun will cause a lot of problems.
If you want to go for creatures I would suggest you have fear enchants on your amps so you can turn them away if they get close. Clopper move slowly and are vulnerable to cold. Arma and Na-jab are good too.
In a team your options are far greater.
Melee
Since you got to melee 183, you must know by now what kind of mobs and techniques you prefer. I would just go for higher star ratings of the ones you like.
Healing
I haven't found any problems with the new healing. Now you just have to be a more careful not to let people die, not that that was ever a good idea.
My stanza bar has single heals for top-ups (sap only to cast), doubles for when the team is taking lots of damage (sap+hp to cast), individual bombs (sap+hp to cast), one HP+sap heal and a few heals that have no range (range only). I adjust the HP double heal to the tank, so I heal 3/4 of their total HP.
80 to 90% of the healing is singles and I use the doubles for 'emergencies' like dealing with ADDS.
The no-range heals are used after a spawn or when we are topping off HP and sap after a

kill.
Everyone has their preferences for set-up though and that is just my own.
I hope that helps make your healing a bit more productive.