I use Reaper too and your recording sounds very clear. More important than Reaper or any other DAW is the mic you are using. Yours sounds quite good. What is it? Also sounds like you have a nice, low noise floor. Must have a good acoustic environment. Your mic may be picking up a little too much around wherever you tend to be sibilant. Usually 4-5kHz. Maybe try a De-Esser set there?