Then the others have a completely different ED: Odyssey version than I do.
No, others just know where to look after them (Inara is of good help)
Manufactured materials, in HGE:
Pharmaceutical Isolators - Systems with factions in Outbreak, preferably with factions not having any other states, preferably Independent or Alliance factions
Improvised Components - Systems with factions in Civil Unrest, preferably as above
Military Grade Allows, Military SupeCapacitors - Systems with factions in War or Civil War, preferably...
Proto Radiolic Alloys, Proto Heat Radiators - Systems with Factions in Boom, preferably...
Imperial Shielding - Systems with Imperial Factions, no special state needed
Core Dynamics Composites - Systems with Federation Factions, no special state needed
Fed and Imperials factions can override the states so even you may find a HGE from a Fed faction in outbreak, that HGE may contain only Core Dynamics instead of Pharma Isolators.
High Population is said to help increase the chances of finding HGE, but i've found PI even in systems with less than 100k population
Manufactured materials in mission rewards:
Exquisite Focus Crystals - Mission reward at Allied level
Biotech Conductors - same