Warm Season Grass -- I often use a split app of DIMENSION.
I use 1/2 of the recomended annual rate for previously treated yards in the fall. Then two 1/3 Apps in late winter (FEB~March) and 1/3 again in May. This keeps me below the max annual rate in in the middle range too.
I find that in the second season that I can spot treat weeds.
If I fertilize well in the Fall, I often can just do organics and mircos including iron in the early spring. Fertilize lightly in late spring and early summer. Higher feedings in Sept and October.