ok, 350g water to 500g flour and a higher browning level didn't improve on the rubberiness, but the rising was better. a big air bubble formed below the breads top (i should have made a cut here).
next time i'll also try the 1000g bread program to give it 10 more minutes.
did the 320g water mix today, with the 10 more minutes and i like the results. much browner crust, but insides are still a bit rubbery.