Nothing wrong with Nittos per se...
You added a taller, wider, softer sidewall tire. With a higher-than stock aspect ratio (normally 30 in the rear), you'll probably need more air pressure than usual. Right now if you had a gopro on them you'd see the tire rolling over and mushrooming as you turn. You have a higher moment of inertia than before, that's the milliseconds between when you turn and when the sidewall loads and the tire grips. What is the air pressure in the tires?
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