Yeah, mine is also maxxed out for chickens at the moment.
I have had 1 out of 3 Welsummers be bad moms... And she wasn't really a bad mom as much as a bad co-mom. 2 wellies were sitting at the same time, but one's brood hatched a week before the other's. Bad co-mom wellie was the later batch. She got jealous that momma #1 already had chicks and tried to steal her nest. Given how chickens work, I should have seen this coming, but I didn't. After I got all the drama worked out, I ended up just giving all the chicks to momma #1.
... I find it hard to blame the chicken in that circumstance, as I have the bigger brain and should have known better.
I have had a different Welsummer co-mom at the same time as some other hens, but they all set to brood in the same 3 day span, so no one got jealous.
Anyway, whenever it is that you have room for more chickens, I hope it works out for you (regardless of whom you let brood)