I started spoon fishing religiously last year.
I found a whole bunch of things to work. Some increased my landing % by probably close to 30-40 percent. I found at the beginning I was losing close to 60% of the fish I was hooking in the way of steelhead and coho. Made these changes and I was probably landing 95+% of the steelhead I hooked on spoons by the end of the year (could have just been a bad streak before, or a good streak I'm on now though, never know).
1) First of all... change all the hooks that come with the lures. Can get expensive but it is totally worth it.
2) Get sickle hooks... they don't need to be open eye ones either, just a normal sickle hook helped out a lot. I like matzou or "Big River" gammies.
3) Been echoed a few times... make sure your hooks are sharp, carry a hook file and make sure it literally sticks to your finger nail. Big rivers hold their point well.
4) Braided line... more sensitive so you can feel the light bites, no stretch = better hooks sets and better connection to fish during fights
5) Set your drag properly... I like to have mine so that it peels line out if I set the hook HARD. Good to have it so that if you get a hard hit (like a steely hit) that it allows line to pull out so that you don't have the spoon pull out of the fishes mouth. You need to experiment lots to get the perfect balance of just loose enough with too loose (if it's too loose you can't bury the hook). Make sure you don't let anyone touch your drag after that
Cheers,
Dan