I'm enjoying engineers too. Managed to get some good mods from felicity ... Level 4 FSD for my annie and level 5 for my asp taking it to 50 ly. Have had only one unit of arsenic but everything else i managed to pick up as i was doing other things. It looks like there is other stuff i havent done yet which may be a bit more 'grindy' but i'm satisfied for now. When i was ready to mod i just whizzed round three stations and picked up the commodities in one go. Wasnt that hard. Just got to Jaques in about 7 hours and handed in lots of exploration data so having a well earned rest.
I look at the engineers as a pretty shady and oddball bunch and dealing with them is a bit of a gamble anyway