How sure are you of their age? At 8 weeks, the comb and lack of wattles indicate that they are pullets.. However, they aren't as feathered out as I would expect at that age.. I have a few 5 week old Wyandotte chicks right now and they have more feathers than yours.
Blue gold Wyandotte am I a pullet? I act like a cockerel and muck around with them too but the comb is throwing me. Born 3 November so 8 weeks old.
Silver pencil laced Wyandotte same problem as above unsure of sex. 8 weeks also.