I’m with you. This is the worst banner for me too. I can’t get my pity rate up, I never got any copies of Eirika for my merge project, AND to top it all off, the game REFUSES to give me a copy of summer young tiki with usable IVs
They consider any IV that's not "perfect" or "neutral" to be unusable, judging from the "This unit is trash" posts they usually put on other people's questions about units. xD
Mathematically speaking, you're running bad but not atrociously bad. You've summoned 20-24 units, and the chance of finding a 5* is something like 1 in 16-18 depending on the colour.
FTP, in desperation I summoned one last orb with my 5 orbs after the 11. Got a trash 4 star. FML. 125 orbs with nothing at the highest pull rate banner.