10 is outright too much! I use Scott's organic, which has a similar analysis and consistency to Ringer. I use a Scott's spreader, so the settings are the same as yours. Scott's recommends using 7 1/2 with their lawn food in their spreaders. I use the 4 1/2 setting with great results without wasting a lot of fertilizer. I'm thinking of going even lower this fall to maybe 2 or 3. I prefer to do 3-4 light feedings instead of the recommended 1 big one each season. This way less food is lost to runoff. With these settings, I doubt you'll have to refill until the next feeding. I have about 7000sq ft. Occasionally I have to refill toward the end, if I didn't load the hopper full enough.
Paul's idea works great too. I'm just in too much denial for wasting my money on the spreader to not use it.
