So, figured I'd weigh in and expand on what lolix said. I tend to agree with most of the points, but thought I'd bring up the following.

Quote Originally Posted by lolix View Post
Yuyu is a personal favorite of mine , and she is a really good witch to have , seeing as she's an elf (increase attack speed and attack damage ) and she's also a gold. She would benefit greatly from sherry's passive for example (she already has dps comparable to belinda which is a plat. I think she might be higher actually) , but luckly for you , you got despara , she's not a priority right now. She might be usefull in the future tho.
Yuyu is good. Not only is she a gold, and thus potentially cheaper, her skill awaken makes her cheaper still, and maxed out she deals 497 base damage compared to Belinda's 396 (and as a gold she benefits from Sherry's awaken ability). Not to mention, if you ever manage to get an Olivie, once awakened she'll cost the same as a silver witch of the same CR.

Quote Originally Posted by lolix View Post
Also , i would raise another iris (if you have no problem with raising duplicates). Fedora is quite a bit worse then iris untill her SAW. And having just 1 fedora , 1 iris and 1 alissa , seems a bit weak. Ofc , there are others that dislikes duplicates and would advise cr/su-ing main iris. Cheap to deploy healers is not a general bad idea either , so that;s up to you , but i'd go with second iris.
On leveling a second Iris vs Fedore, my personal suggestion would be to CR your main Iris, and level Fedora. The reason is that while Iris is generally better, the two have slightly different roles. Iris is more of a burst healer due to her skill, while Fedora has higher base healing (21 more attack to be precise), and once awakened is cheaper to deploy.

Quote Originally Posted by lolix View Post
Now to answer , your base question , yes i would keep leveling the cc-ed/AW-ed units , untill 40 or 50 then only use armors with triple fairies. That's the most efficient way to level up without wasting gold.
On the one about leveling CC'd/AW'd units to 40 to 50, I would specify that you should aim for experience values that will put you close what you would need to evenly level up to max with plat armours and spirits without wasting more xp than needed. You can find the tables for that here. I usually go to the first one that is 50 or higher personally.

Quote Originally Posted by lolix View Post
Now let's talk what i would awaken :

a. Imelia - she will buff both herself and condrad , and she is a very good general duelist
b. Deine. SHe becomes more expensive but gets even more base defense , which works great with bernice's passive. You want an imortal tank ? this is it. Only better alternative being gellius , but that guy can just take a beating. Deine can also dish out.
c. Despara - she gains attack speed , which might not seem much , but at the amount of damage she naturally does , she becomes a pretty damn high dpser after AW. + she gets a god damn panther.
I would add to the list of units that benefit greatly from awakening, Saki, who not only attacks faster, but also has her cost reduced by 4.

Quote Originally Posted by lolix View Post
5. keep rainbows till SAW. And if space is a problem , generally try feeding them to units with abilities that get signifiantly better with levels (aka ones that increase damage/defense/etc) by a certain procent , rather then units that get ....dunno , let's say cd reduction from them
On the note of using Rainbow spirits, there isn't really a need to wait for SAW if you already know what the SAW is for the unit and plan to use it. Or if as noted the unit already will benefit greatly from skill levels. That said, try to avoid using them when the skill can be readily obtained without the fairies (for instance, if the Big Adventure Anna star event does actually happen soon, you can farm Gadoras, who has the same skill as Despara when CC'd). Additionally, it is most cost effective to use Rainbow spirits on level 1 units, such as just after CCing or awakening since while they do not give experience, their cost still is dependant on the level of the unit. A level 1 unit will cost 200 gold to feed a Rainbow spirit, a level 40 unit will cost 1760. That said, don't be to worried about keeping to that if you already awakened the unit or have a unit with the same skill to feed to it first.