Are are you picking up the line off the dock with the boat hook and pulling it back to the boat?I can't see any good from jumping off the boat without at least one line attaching the boat to the dock if you are solo sailing and i do not allow anyone to "jump" from the boat to the dock when I am sailing with someone. Maybe that is because I'm 73 with bad knees. Of course, the height of your deck from the dock and your age may determine the risk you are willing to take, but for me it is a non-starter. If you get hurt on the jump who is going to control the lines and the boat while you are writhing in pain on the deck? I can imagine watching the boat blow off the dock and downwind as I scream for help.
There are devices like the "Landing Loop" or a different device called a "Docking Stick". I use a Docking Stick but have also used a Landing Loop before I got the Docking Stick. I attached the landing stick to the end of my fully extended boat hook with the length of line secured to the midship cleat set to stop the boat where I want it to stop. It is used as the spring line.
Or are you putting the line on the boat hock and then extending it to the dock cleat with a loop on the end of the line that goes over the dock cleat?