Vague memory, but I seem to remember Phekda was a real "charming" system. Good for inflating the rating, but endless, tiresome attacks.
Also, where you thought it shouldn't be as infested, Alioth and Vega.
I didn't visit those one-planet stars that often, but wasn't all of them really nasty? Maybe Lave was a little "quieter". But yes, Riedquat was probably high up there. Got sick of all the killing... With that rate I'm surprised anyone is alive in the Old Worlds by 3300.