Cant clone :(

Well your problem is probably that your base hp is too low in the first place to clone. What I mean is that your hp has already lost the 33% from ameno before you switch with dahlia. For example:

Let's say your base hp is 1000 without ameno or dahlia.
So when you use ameno your base hp becomes 670ish
Black dahlia then takes 60% of 670 instead of 60% of 1000
So your base hp is actually 268 (from base 670) instead of 70 (from base 1000)

So the way you'd fix it, you actually have options. Option #1 would be to use a Ganei on your Ira, that would put you well over -100% and would allow you to get the Warcry 4 buff from gladiators without really making your cloning impossible. Option #2 is a both harder to ensure it will work because I'm not sure how much hp you have without ameno and how exactly your equipment is set up, but if you put the ability ☆HP on your daiginjo, you may be able to raise your base hp high enough that your clones will work (not sure though). Either way I'd personally recommend Ganei on Ira, yes you loose out on 2% Atk but honestly the flexibility you gain from the -30% hp that comes with Ganei outweighs that 2%, that's just my opinion though.

Hope I helped lol. Good luck with your ninja ^^