To be honest I know some who swear by plucking or removing feathers from around the vent. But I do not. I have as fluffy a birds as many. I have a pair of Blues from Bamma's line who are huge. As big as my best Buff hens. And like my Buffs they have no problem being breed. more usually depends on how well the male knows where to do it then anything. my White cockerel for the first few days missed, but now he is hitttin the nail on the head. And I have 100% fertile eggs from his pen. my Harold, a Brown Red, never did let an egg sneak out unfertile. So I guess it is what ever you feel comfortable with. I do not remove feathers and have great hatches. Something more to worry about is your male just being lazy and picking favorites. I have that more as an issue. then you need to just remove the fertile hens and let him have no choice but to breed to the other hens