In all seriousness, I'm beginning to wonder if this isn't the reason Welsummers are considered a rare breed among breeders. I have been doing visual checks of egg fertility, using Welly eggs for morning breakfast fare and what I'm seeing with my 5 girl's eggs is that two out of three are not fertile. Of the laying Welsummer hens I have I only see the roosters tending two of them. I've seen a couple of the hens avoid the roosters and one actually chased and attacked my Lavender Orpington rooster when he tried to mount her. Not a ticket for propagation of a species.
Our Welsummer rooster does his end of the job. Yet I did not see one full blooded Welsummer chick hatch with my Buff O's first brood. We have possibly two Welsummer/BO cross roosters, one Welsummer/BO hen cross and one that's up for grabs right now as to which gender it is. I'm anxious to see how these cross breeds fare as far as fertility and reproduction is concerned.
Yet these five girls of ours lay 5 eggs every other day and 2 to 3 eggs. Yesterday one of them laid an egg that weighed in at 2.4 ounces. It was huge.
I hope you don't give up, Katatonic123. If nothing else, the eggs are worth the hassle.