And RP is supposed to be be fun, create interesting scenarios for everybody involved, if you win 99% of the time, it's not fun for me, now is it?
Sure, don't do the crime if you can't do the time, but it's a game. Not everyone is cut out for legal or civilian type roleplay.
I think better option would be, when police car starts a pursuit they type, /pursuit id, based on that, the police car speed gets scaled to match the evading car.
There would ofcourse be some baseline, so it doesn't get set for faggio speed or similar but for supercars it could be scaled up. For everyday cars, it's should stay just the gta v normal police car speed.