Have you put out any fertilizer? You need some

 

I put down 15-0-15.

 

who's telling you your soil report looks good??? 6#/Ac of Phos is borderline lethargic.

I'm assuming this is UFL M1 test, and 3ppm of Phos is below any level of sufficient turf nutrition. With your CEC levels you're either growing on some sandy soil or the ugly clay that I've been blessed with as well. This is not a magic pill solution but you need some Phos down asap to give that turf a fighting chance.

 

Wait... this is centipede. Do not add Phosphorous. Or Lime. Actually you might even do some elemental sulfur to lower the pH.

Centipede wants little nitrogen thru the year.

 

This guy says no phos and the guy above says needs phos lol Ist 5.7 ph in the range for centipede

 

https://www.ncagr.gov/soil-fertility-note-9-problems-centipede-grass/download?attachment

Taking Care of Centipedegrass Lawns

Centipedegrass is one of the most popular turfgrasses in this area. It requires a smaller amount of fertilizer and less frequent mowing than some other grasses.

www.lsuagcenter.com

https://turf.ifas.ufl.edu/media/hortifasufledu/turf-science/turf-science-pdfs/home-owners-guide/EH_HomeownersGuideToCentipedegrassManagement_Factsheet_Final.pdf

 

thank you for taking the high road @g-man. I was holding my tongue.

 

OP, I also have a Centipede lawn in the Florida Panhandle. How long have you been at the property, and how long has it been predominantly Centipede grass? Is the area of your lawn which is struggling getting enough water/irrigation? The recent drought in this area has posed some challenges in my yard with thin spots.

The 15-0-15 you used is probably adequate, especially if its got some of the micronutrients added that your yard is lacking. It will likely take at least a full growing season and re-fertilizing before the overall soil test numbers improve.