Anybody have any suggestions for colors for spin'n glos and bait combos which have worked well for coho and/ or chum. Thanks in advance.

My experience is that with silvers, I use red, pink(cerise), or a very dark orange tipped with eggs. for chums, I use anything green with no bait, or yellow/chartruese corky with orange spots and orange yarn with no bait. that works for me... Good luck to you.

Try plunking a chartruese or pink spin'n glow with a small sandshrimp or raw prawn for chums, you might even find an early winter steelhead. Try a rocket red cheater with eggs for coho. It all depends on the water level. If the waters low try purple. All 3 species love purple.
good luck

bankwalker beat me too it. My favorite is two spin n glos in tandem a #2 and a #4 in pink with mylar wings. Then, double hook setup (when legal) and a sandshrimp threaded on. Best chum rig I've used plunking, and will nail any kings/silvers that come in too.