I know its been two yrs ago but one thing is the air intake tube is missing the extra hose clamp on the carburetor, its sucking in air giving it a rough idle, you can adjust all that stuff and it most likely won't make a difference and the fuel line is up n down and up n down before it gets to the carb, give the fuel line a nice smooth flow.. carb fuel adjustment is 2 turns out and air is 1 turn out..
Take the gas fitting off of the carb and put Teflon tape around the threads it's gitting air in it somewhere thats why it boating..or the float needs adjusted but I think it's air gittin in the line..tape up the threads and see if it helps..