Soil test results
Your soil test results are very common for around here. The problem with turf yellowing is it could be several things and depending on what it is if you misdiagnose you could damage it worse. One reason for the yellowing could be Nitrogen deficiency, however if you add more Nitrogen but that wasn't the problem then your centipede could go into decline. Centipede needs 1-2 lbs of N per year no more than 2 lbs. Overwatering or under watering may be the cause more commonly overwatering which leads to a fungus or root rot.
Former PCOIC for the US Air Force
Currently Certified PCOIC for
Grass Roots Lawn & Landscape