My experience with full flush in the past and on alot of cows. You need to use him on a moderate framed cow that has alot of depth. He will take depth away. He will add muscle but would say if you want them stouth they need to be out of a stouter cow as he will not add alot of bone from my past experience.
So use moderate framed deep bodied, good bone and make sure they are sound also. They will toe out alittle and can get straight on the back legs as well on the wrong cow.
They are good feeding cattle as well.