Aluminum on it's own is bad enough; aluminum+saltwater+downrigger cable/ball equals a battery which equals voltage that CAN repel/attract Salmon. This is probably not your main problem though. Depending on where you are fishing, Pinks CAN be difficult to catch.
More information as to where you are fishing, what you are fishing for, how you are fishing (down rigger trolling, mooching, jigging) and what you are using would be helpful.
If you are down rigger trolling, easiest thing to use is a spoon. Troll about 2.5 - 3.5 mph Fish at a depth you see bait on your sounder. If you see no bait, you are either in the wrong spot or have a crummy sounder.
While not quite as foolproof as a spoon, Flasher & Hootchie will usually out fish everything. The rotating Flasher imparts some action.movement to the hootchie. It is my strong opinion that a heavy leader of 50 - 60 lb test be used. At that line test, I use a leader length of 4 time the Flasher blade length which will usually be 44 inches. I also like a single 5/0 Mustad number 95170-ss hook connected to a barrel swivel then the leader. The mylar skirts in UV/Glow colors also help. You should think of the Flasher as adding movement to your lure/bait, and the sound/sight of a feeding Salmon. There are a gazillion colors of flashers out there now, back in the day we only has green & red. I rarely fish Flashers these days, but when i do i use a UV Purple Haze Plaid.
The best tip is to go fishing where the fish are seriously biting, that way you can quickly see if it is you or the fish that is the problem. I got 4 springs to 22 lb on one rod in 45 minutes at the Campbell River hump last August fishing about 200 feet deep. Ucluelet can be phenominal; I have has several days of 30+ quantities on 30+ size that keep me going back every year. Sadly my last year of 30+fish was 2009; back in the 80's - early 90's it was every trip.
