Filippo,first of all, nice work!! The pictures were really nice, and allows me and others on the forum to train our eyes to what LMB that are doing well look like (and then can see the WR charts as well). So thank you for sharing that data!
I don't have anything useful to add regarding forage vs WR in your larger LMB. I am sure one of the pros might chime in or maybe Bob Lusk. There does seem to be a small drop in the WR of the larger LMB.