It's frustrating. I had to slow down more just to make a turn, barely.
The racing bikes , like the bmw s1000 rr hp4 race are much nicer and fun to ride. Just did use it now and it doesn't have this understeer, and powerslides, fun bike. Edit: well not as much at least.
Plus many bikes you can apply full racing modification on, and transforms them, even livery.
Also, you could try motogp19, bikes are thrill to ride as hard as you can manage, even historic 2stroke bikes.
But same as in ride4, you have gates like needing to unlock historic bikes thru challenges, they're not so easy, depends on each one.
As usual bad balancing of difficulty.
I dont have ride4, so i can't tell if it's the same thing as in r3, i read it's closer a little in feel to to motogp19.
I hope their next sbk game will be as fun as that one.
Edit: plus you can try modify setups like suspension on racing modified bikes, not so sure if helps that much, can't remember.
I heard in ride4 the setups do affect handling pretty well.
Edit2: you could also use the rear brake separately to induce a rear slide.
Edit3 lol: what's most frustrating to me in ride3 is the on rails a.i. bumping into you, and the silly oil change that suddenly lowers you power each 200km.