I finally bought the Fer DeLance and got it nearly all A-Class (except Life Support). I have been highly successful at RES farming thanks to the A4 Plasma Accelerator, destroying the Power Plant on an Anaconda in two easy shots.
Any CMDRs struggling with taking out larger targets are free to come by to this awesome system I'm in. I will be RES farming with my FDL until I get bored with it and trade it in for a Python or Type 9.
System:
Iota Persei - with a lot Resource Extraction Sites.
Station:
Walker City - only
0.18-0.3ls to the nearest RES. Walker City also has 13 ships, and the vast majority of parts as well. LHS 1446 (a decent RES area) 3.5ly away has the parts Walker City is missing fortunately.
This area doesn't have any particularly good trade routes, but it is about 70ly away from Empire or Alliance space depending on the direction you go.
More commanders are needed to help kill all the Anacondas spawning everywhere so please check Iota Persei out!
tip: feels like cheating, but if you don't see any large ships as soon as you come to an RES, go back to Super Cruise and return immediately. This will refresh the area unless a dumb commander remains in the area to kill Eagles (pocket change). If you see a large ship (Anaconda, Clipper, Dropship, Python) stay in the area because it will spawn large ships nonstop until you need to retreat. Patrol with a ~12km radius. A-Class Sensor highly recommended and a Kill Warrant Scanner is a must.
edit: Keeping Iota Persei safe for the time being! edit 2: Look for Yellow-ish smoke trails; tell-tale signs of large thrusters.