[Autumn]

If Fast Offense didn't exist, you'd be hard pressed to see a Summoner actually summon.

This is true for youkai who don't have natural bulk, yeah.

As for the OP, I think (Youkai LV*2.3~2.4) would be a fairer number, given that you still have to grind a full level track for it and the spells don't receive any of the benefits that other spells enjoy, i.e. Evoker's boosts. The other suggestions are completely fine and should be implemented.

And I'm fine with this, as long as youkai spells maintain some semblance of needing SWA in the equation so that some sort of weapon build is needed to not be able to deal ludicrous amounts of damage, I'm fine with that.