A Big Boy might be an upgrade at this stage.
Is it luck, the bike or is Ross hard on the bike? Whichever it is he's had a terrible time on that Yammie.
I was told by Hilton Hayward that in offr-oad bikes KTM use steel frames exactly for flex.
https://www.motorsport.com/motogp/news/ktm-steel-chassis-ducati-pierer/4388101/