Q1: lures in low light warm water, live ales in cooler water when available. Skein under bobbers as the water cools; though spoons and spinners drop off; plugs are still worth throwing.
Q2: glow 3/4 oz spoons account for more king salmon than all other pier spoons combined.
Q3: kings are not as line shy as steelhead (but 2lb tends to be more about ego than fish), but on piers I rarely push above 10 anyway. In rivers fishing spawn and bobbers I typically run 12. I know guys who fish flouro leaders testing 20.
Q4: in general, I fish whenever I can, but if water temps are poor; I’m considerably less anxious. I worry less about bait in the fall than spring and summer.