Salmon fishing is more challenging because we have fewer fish planted. This year the thermocline was driven deep by all the NE winds and we spent more time 10+ miles off shore just to find a few fish. Lucky to be retired and in a 21’ boat so I could pick my days carefully.
I think you would benefit from taking a bigger bite of water by including Shellfish’s suggestion of in-line planers and leadcore. How many rigs and which ones is up for debate. I would add 2, 5 and 10 for starters if you are typically fishing 2 guys and 6 rods. I would also suggest you get various Snap Weights with Off Shore OR-16 releases so you can add more depth to what you have. You can find charts that provide info on depth achieved with various weights.
In addition you could use your 2 color on one of your downriggers, the SWR, a favorite of the famous Capt Dan Keating. Buying his books on fishing salmon is a great way to shorten the learning curve. I have all of them and still refer to them. He would also likely tell you to run a flasher/fly on one of your riggers especially early AM when fish are more active. Many think even if the flasher/fly isn’t hit it attracts fish to your spread. If you don’t want to get into flies a number of people I know run spoons behind their flashers with 4-6’ leaders with good success.
Many fisherman who run all spoons troll faster, >2.5mph, than the flasher fly program typically <2.5mph. This summer on the advice of a friend, who has been doing it a number of years, I tried trolling 2.8-3.2mph with a combo of flasher/fly, spoons and Brad’s cutplug/Big Al Flasher and they all took fish. That speed is way faster than most advise but I caught fish and covered a lot more water. I reviewed one of Keating’s books and he typically lists his trolling speed in knots. I was delighted to find that when you convert to mph those speeds are right in his zone. Same zone for the famous Capt Bill Saiff on Lake Ontario who and has a number of instructional videos on YouTube.
I think using some version of slide diver is a stealthy presentation that gets more bites in our clearer water. But running them as ½ of your spread may be overkill. For whatever reason wire divers for me get more bitesl Wire divers setups are another expense, learning curve and fussy to work with but for me worth it. For you I would start with leadcores. Good luck.