leave your top vent open, and use the bottom vent to adjust temps
I cook on both One Touch and daisy wheel kettles and I find it much easier for me to work with the daisy vents on longer cooks where I can close off one or two vents if needed.
I have both types of kettles and will try the daisy vent one and will block off the other two and use foil where there's no charcoal on the bottom grate...