These settings can be used only as a guide, they are not absolute. The speed at which the applicator walks, spreader condition and the texture of the turf will alter rate of application. If product remains in spreader after application to recommended square foot coverage, spread remainder over same area going at right angles. See the diagram on the label.
Hi-Yield New Process Premium Lawn Fertilizer 15-5-10 may be a good option to use on your bermuda.  That is going to vary depending on what nutrients are needed. We actually have a great guide that can explain how to select the best fertilizer for your lawn.  You can find the guide hereÂ
Q
Is Hi-Yield New Process Premium Lawn Fertilizer 15-5-1 a slow release formula?