Kujo 24x2.35" tyre - opinions wanted

My mate Luke has just mounted an IRC Kujo 24x2.35" tyre on his uni. We went for an offroad ride yesterday and he found the new tyre to be difficult to control. It had a tendency to climb out of ruts and across cambers. He felt like he was constantly fighting for control. Lowering the tyre pressure didn’t help much. To me it sounded like one of those tyres which behave badly if they are not at the perfect pressure. Has anyone else used this tyre and had this experience? Has anyone used this tyre with no problems at all?