Your right, DSF is only in the Elite. Although the AB app has tracking error adjustments, the Kestrel version does not include them. The only adjustments you have control of are MV and BC. While you may have accurate data for them, if the calculated results for elevation and W hold are wrong, you can adjust MV and BC to get better end results. If you cannot get to settings that work for all distances you can always build different gun profiles with different MV and BC for range brackets or upgrade to the Elite software for DSF and the ability to true trans sonic distance. I also believe that the Android version of AB will connect to the Kestrel and may offer the tracking error adjustment in the app. Even simpler, make a head calculation adjustment for your know tracking error.