I am starting to work on EEs myself, have a couple pairs.
EE is a very recessive gene, so even with both parents being EEs you will get few babies with actual big pectorals. They will have the genes, but most won't have the actual big pectorals.
As mentioned before, you would have to breed daughter to father to increase the chances of big pectorals being born, and so forth.
What colors are the females and the male you have?