Just saying that yes it'll be 2 suspicious kills in 5 rounds, and that's about it. If you choose to still convict them off for that, then your OW score just gets lower because most people won't convict. You should know that many cheaters also have access to OW (with a profile revealer) and they themselves know where the line is between too blatant and not obvious enough, helping push the cheater in the clear when they vote no.
In my opinion, you are just hurting yourself if you try to do that. That's how Valve's system works, it's unfortunate but there's nothing really to be done about it. I've had cases where I really wanted to ban this guy because he had 3 instances of flicking to the right (legit AA) and was very aggressive shooting and prefiring corners in a 16-0. I KNEW he was cheating, but I didn't have the evidence to back it up, only assumptions.