I hate that guy.
As usual, be careful when cheating on your main - don't submit nigh-impossible scores or have some whack RS/SS times.
When cheating on shells, don't immediately transfer your "earnings" to your main, and use a proxy to mask your home IP - so if your shells are frozen, they won't chain to your main.
Overall, just exercise common sense and blend in to look like a "normal" player.
Welcome to cK.