Barney , Are you saving your Big beef seeds? Do you bag them to keep them from cross pollinating? Are you grafting to rootstock? I helped my son build a big high tunnel a couple of years ago (0 X 130' long) but , everything inside seemed to want to burn up. Everything he planted out side drowned out or was tore up by the heavy rains we had. He lost over two acres of produce on the outside. He need to find some tomato's that will produce inside his high tunnel .