Fishing for Coho with eggs?

Fellow Kayak Anglers!

Could anybody share how to increase success in fishing for Coho with eggs? I use salmon eggs which worked great for Chinook but I do not have any success with Coho. Sometimes I add sand shrimp and various scents but still nothing -- except I catch a lot of Sturgeon :-). Motor boats around me that pull lures catch Coho quite often but eggs do not seem to work. Is there anything I should add to the eggs, fish at different depths than for Chinook, look for different places on the river, fish at different time of day. Do Coho bite differently than Chinook, what is the behavioral difference between Chinook and Coho, habitat difference, etc. ?

Thank you so much in advance for any suggestions.

Fiszka

Where are you fishing?  We catch silvers on eggs in my area...

Nevermind on the where - columbia, right?  I have no experience on your river... :/

But we just drift fish or float eggs... we being my friend who wants me to paint the bottom of my kayak so I don't scare the fish away.