Just remember the HGE rules.
1) If it's faction stuff you're looking for (Core Dynamics Composites or Imperial Shielding), make sure you head to a system aligned with that faction (durr)
2) Make sure your chosen system is HIGH population, 80m plus, this is what makes the stupid things spawn
3) The system state stated in Inara is WRONG, for both CDCs and ISes, you want NONE, not boom. Boom will give you proto heat radiators.
4) Fly straight up from the main star exactly 1400ls, no more, no less, and run huge circles above the star at 1/2 throttle.
Do this and 50% of your USSes will be HGEs and most of them will contain either CDC or IS (based on faction).