Enhancing during panel bonus with over 1k garbage units

Can anyone just give me a quick run down of a good way to enhance all this crap during the panel exp boost?

I try to do the 2 1* into 2* to get it level 4, then 2 2* into 3* for level 10, but then I say to hell with it and feed everything into a 4* till level 40. After 10 minutes of this I hate my life that much more.

How does everyone else handle this? It's like an ongoing project I never want to start. Do you guys just ignore for the optimal route and just enhance everything in one go, then grab another group of feeders and repeat?

I stopped bothering because it's painful and still quite slow.

I mostly level up via Legion Battles, then when I hit ~100 or so I'll actually use Goddesses to the rest of the way. Enurta is 2 levels and same type is 3, so you can usually max out pretty quickly.

If you do hate yourself though, then I just feed everything directly into a 4* until level 10 or so. Then feed that 4* into a 4* of the same name. Maybe do that again or directly into my target unit at that point.

I feed 4*'s in the mid 20's to my units since I have almost as many 4*'s as 2*'s and 1*'s and past 20's you're saving money but losing experience (took more to level the 4* than it's giving you back as a feeder). During enhance bonus you can probably go into the 30's and still be positive on experience. But I haven't done the math.

Personally, I just throw 40-50 of them at a 4*, then eat the 4*. It's horribly ineffiecient, but it's either that or just trash the 1,000,000 brave points in my inbox (and then figure out what to do with all the 4*s). Seriously, it's out of hand...

Great suggestions. Thanks!