You didn't say exactly what approximate height your are cutting from, down to what height you finish at. Do you know for sure what your blade height is when in the cutting position you mow at? The various settings that come on mowers aren't always what the blades are actually cutting at. Check them at the front tips when in the cutting position with something reliable like the gauge Deere sells,or a small steel ruler etc.
Mowing in circles looks like crap, and causes the clippings to pile up as you go. If you have a discharge chute on your mower deck, try raising it so that the clippings can fly farther and spread out better.