These 4 are Wyandotte/Orphington mix. I had the same result though. The 2 on top I’m guessing are males..at 2 weeks old, they have no tails and there wings are half the length of the others plus they are bigger. Won’t be able to be 100% for a couple weeks.
I just tried this with my 5 Wyandotte crosses at a week old. They're all mixed between my Silver Laced Red rooster and Silver Laced Red, Columbian, Splash Laced Red, and Rhode Island Red. I don't know for certain which chicks are from which as I didn't mark them, but I'm pretty sure I have a RIR cross, 2 Columbian crosses, and 2 Splash Laced Red crosses. According to this feather test, I should have 2 roos and 3 hens, although one is a bit iffy. It may be 4 hens and a rooster. Not horrible I guess.