sounds like you have a good idea what is going on. If you are looking for things to change to try... try a bit longer leader. I am for 2 feet. And I get shot right to about a foot of my presentation. dont be afraid to put shot on the leader. You can try a smaller hook. I use 12s on murky and 14s on clear days. 10 isn't anything out of line though.
another thing that caught my eye... i only group my shot after the float. Like you said. 2 shots. then i never have 2 together. Spaced out ever 8-10inches give or take depending on depth and run speed. Try spreading them out.
the last thing is your presentation. just beads? Switch it up. you never know what they are after. bags, different color bags, single eggs, beads, worms grubs pinkies flies you name it. Also the striking zone, dont be afraid to be sliding your float up until you find bottom.
hope this helps, a few things to try out anyways.
cheers man good luck