The running attitude is typical for a stepped hull, the air drawn under the hull makes the boat run very free (and fast), add a little chop and this is what you get.
Well set-up, my stepped hulls run stable in a similar way.

The cornering of these hulls needs getting used to, it's not smooth at all, like a nonstepped hull, it's more 'square'ish...

Trimtabs are a bandaid for a poor set-up, this is simply the way these type of hull run.

Regards, Jan.