I love my ssk8. Try xtol straight or 1:1 it works so much better than anything I get back from the pro labs. Also I find xtol not to fiddly for timing when throwing different films at it.
turn down rotational speed to minimum. Have yet to lose a 120 roll so far
4 to 4:30 works great for most bw films in xtol 1:1
I will have to try XTOL. You have a Super, I have the old non-super with a motor without rotational speed control, although, I'm suspecting I could add a simple motor controller to reduce the speed.