I did most of the fighting in high RESs in Brani, Aphra, Freng, Kremainn and Asellus Primus. It would have been much safer if I did more engineering before I started the combat grind. Speed is what you need. I made the mistake of using the materials/data I had to upgrade the standard thrusters, to grade 3 dirty drives, but I got more speed with standard enhanced thrusters. The other mods I had were some low level ones for the PP and PD to be able to boost more often. Obviously, I got a level 5 FSD for the exploration. I was using standard 2C shields , which were too weak to withstand the constant ramming and scanning.
Thanks for the trade rank suggestions.
BTW, the combat is not that difficult in the Sidewinder. I was exploring how the game mechanics work. It seems that the NPCs are programmed to shoot the highest risk ship, so as long as somebody else is shooting them, they dont shoot back at you. The trick therefore, is not to upgrade the basic pulse lasers. It's different with the SLFs. The moment you open fire on the mother ship, the SLF will be shooting you from behind. Typically, your shields will be down in three seconds and your hull not long after, so I gues that they're programmed to shoot either the lowest risk or any commander.