I tried the ultmato system last year on 3 determinates and had horrible results. I found it did not contain the branches at all.
Are you saying you move the cross pieces as the plant gets taller to keep the branches contained ?
From the photos it appears you use them as a trellis, not encircling the tomato,
Is that correct
Maybe that is what I did wrong, I encircled the plant and it outgrew the circle through the sides, it worked fine for the determinate tomatos height wise, but the side branches did not do well.
Hope my question makes sense....so I can try your way this year if I am understanding correctly.