Definately Points to Ponder... Usually turf, especially sand, is very stable when it lives in a self-sustaining soil environment...
The only time I see runaway top growth in such soils, is when there is an excess of rain...
How many inches per week are you irrigating???
How often do you do the Sumagreen apps???
Water/air ratio in relation to water flow to/from any plantlife is a Basic Fundamental Concept in understanding seed germination as much as transplanting a 20' Maple tree in 90 degree weather...