Alex,
I think running a leadcore with a flasher/fly combo along with the leadcore would be a little to much for the walleye boards to pull. You could switch things up though run your stickbaits off the leadcore and try your flasher/flys off the riggers. I run a 10 color off of the inline offshore planers with either a spoon or a stick bait and they pull pretty hard, it works but they struggle. Don't forget cheaters, probably 1/2 the fish that I catch are on cheaters.Thats just an extra line attached to your main line with a rubber band or you can purchase the actual clip in Dicks or most fishing stores for that matter. Excuse me if you already knew about cheaters, just giving you some options. Good luck and don't forget to post some pics.
Tom