Spoon fishing became my go to method probably fifteen years ago after finally having success for summer runs on the Skoke.Over those years I have learned they work and work good.They are a simple technice to fish,little involved as far as terminal tackle.
I too stick with the basic color for winter and summer fish.silver and gold are my goto colors.I do have to say that I have caught winter and summer fish on some oddball spoons.I really do not believe that it matters as much as people think.
You get something shiny down into the fishes world and it will react.I have seen many a fish both steelhead and salmon turn down a lure that was too high in the water column but slam it when the presentation was down in the bottom two feet.I am not a fan of bottom bouncing.I will do it if vis is down to two feet.Three feet in my opinion is where spoons start to realy work.Other wise feeling the action of the lure is too important.It takes expieriance but you can tell how deep how fast your presentation is working,unseen, with the action of the lure.
I wil reiterate rob Allens thoughts on covering water.A steelhead is going to bite or not bite.Cover the water and move on untill you find one that is interested.If you want to stay switch to a diferant method.You are wasting time hammering a run with spoons for steelhead.
This is where a long rod and kevlar braid lines realy help.The long rod gives you more controll over your lures depth and speed as it crosses the varring currents you encounter every cast.The no strech lines give you absolute feel of the side to side action of the lure.Notice I said side to side.I do not subscribe necesarily to the as slow as you can drift of the spoon thought train.I do work hard for a consistant side to side action of the lure.You do not want the spoon to spin.Its going to hapen but your realy fishing when the spoon is swinnging side to side down in the lower two feet of the water collumn.Now,when you loose feel of the side to side action,one of several have happened.The lure has caught a leaf or some sort of debri,the lure is not seeing enough current to work{need to reel}
or a fish has just swAllowed your spoon and it is time to do battle!
How I cast depends entirely on the run I am fishing and the water speed versus the size{drag}of my presentation .I would start with your basic quarter cast.How far upstream of twelve you cast depends on how much time it is going to take your lure to sink down to where you want to start your presentation.You want to keep as straight a line,as you can between your rod tip and the lure presentation.This is again where the long rod gives you an advantage.I like to have my rod tip up high at the begining of my present ation.I can always reel to atain lure action [And set at a strike]But having my rod tip high gives me as straight a line as possible and alows me to drop the rod to slow the action of the lure down as it swings across the drift.This is where a casting reel works better than a spinning reel.you can release line and still have confidence that you can set at a strike and keep a straight line going.
Nothing beats confidence.I have put people that hav enever caught a fish into steelhead by setting them up with something shiny on a river with fresh ready to do battle fish.
I hope this helps,sorry it is so long but spoon fishing is the way of my heart I could go on forever.
If you ever want to do some hiking tossing spoons let me know. I will bi fishing my favorite waters from now until feb and there is plenty of room.