Fertility Problem...

So I use to start a game as Walder Frey when he was 16, I wed him and he got 6 child pretty quickly (a child each year), finally, my wife die of a illness, I wed Elyn Reyne and she give me 1 daughter with the bedding event,but after 15 years she didn't fall pregnant again,I already have 6 sons 2 daughter and 1 baseborn son with my guys fertility over 300% and Elyn on 70%(ambition to get a son) but still nothing happen, we are lover and she didn't have any other relationship with someone and I was trying to get as many Frey as Walder have in the book to land them with title (I was paramount of trident with ambition for the iron throne) and I know court have a maximum size of 30 and after 30 its reduce fertility but I already change the court size in the define.lua to 200 max so can someone explain me what happen with fertility please.
I am using version 1.3.2 with the submod dynamic COA and sorry for bad english, im french