Mikev73,
I think Hydretain would be helpful for your front yard. I think your real issue could be sprinkler coverage (I would check this) or maybe even that the zones in the front need more time than you've allowed in the past.
With an east-facing front, your window reflection is probably not what you're having trouble with. If it is, it would be the first I've heard of.
When you're ready to sod, we can give the new sod some added durability by adding some expanded shale to the subsurface. This will keep your soil from compacting, stores water in the root zone, and lasts for years. It's also relatively cheap.
Check your sprinkler coverage, first. Then if that looks good, try upping your time in the zone where you're having trouble.
St Augustine must be kept HIGH during the hot summer months. If you're cutting your lawn at less than 3 inches, then that could contribute to the St Augustine recession. When sunlight is able to bake the soil surface, St Augustine will suffer. So mow at 3-3.5" during July-August, lower the blade to 2.5 during the fall and early spring.
And yes, we do stonework, concrete, etc., and landscape lighting.