On further reflection regarding Rit spirits... I think part of the problem is the inherent PvE balance between PCs and mobs.
If your lvl 20, spawning power = 11~16 Rit PC can cast spirits that can outlast 1 AoE from the average lvl 25-28 ele/warrior/dervish mob, then when you scale that up to the lvl 25-28/spawning power=20 mobs, you get spirits that will take a bar of ele AoEs or a good portion of your barrager/aoe-warrior/derv's time to kill.
On the other hand... if you scale the rit mob's spirits to be killable within 1-2 AoEs from a lvl 20/fire=16 ele PC or a few shots from barrage/aoe-warrior/derv, then if you scale down those spirits for the PC ritualist, the average fire/bow/scythe/axe=20 mobs are still going to wipe them out with one hit.