SB8 really are a highly overrated tyre when it comes to grip. Late braking into corners is not encouraged and overall not a good all-round "ragging it" tyre. They do grip well sometimes, but not consistently. Fast & loose off camber stuff us where they often come unstuck. *
Best compromise I've found is the Nobby Nic (Front) and Racing Ralph (Rear). Good enough for 3 seasons and the ralphs are almost as fast as SB8's. Nobby Nic has some tenacious grip for leaning into corners too.*
Not cheap, but worth it.*
*All in my very honest and humble opinion of course
😀