Some have used ring terminals and wire at every board mounting / ground screw. After doing the same myself, I wont recommend that. Those screws aren't long enough, Threads are weak from the get go. Adding a ring terminal with or without a toothed washer can cause stripped threads in the housing. Then the spider web of added wires could interfere with replacing bulbs later on. Also, If a wire gets a good tug while working in one spot it could break out a bulb socket in another spot.
