how about putting the spawn points in low leve sectors on the far end of the sector out of the way of primary trade routes muck like zweilhander(sp) hidden nav points .
they are out of the way enough that it really would take quite a while to kite a mob 80-100k into a trade route or general , however its far enough out there you have have a higher level scanning skill or grouped with higher level to pick up the hidden nav points that far off
possibly have a warning notify you on screen when you are within say 30-40k of the area (still 50-60k away from traffic)