Indeed, spawning power provide spirits with more health, and weaponskills last longer. So a character or hero using those skills will have more durable spirits/weaponskills. To counteract that effect, you need to be able to put up new spirits quicker. This can only be acchievement by energymanagement.
This again can be done in two way's:
By increasing energy through runes/weaponmods. This has the downeffect that real ritualists don't need those upgrade and can use different ones (like e.g. higher health).
The other way is to use the profession's primary atribute to increase energy management.
The professions that can do that are:
Ranger: reduces energycost of rituals.
Nercromancer: when foe is killed you gain energy.
Elementalist: Higher energypool to start with.
So to summorize, the best profession to use ritualistskills with would be Ritualists, followed by rangers, necromancers and elementalists.
Last but not least: Don't use M.O.X., He is retarded
