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other then herbicides a good method to get rid of crab grass completely, is to lay out painters tarp , clear plastic roll on the most effect area for about 2 week to completely kill the the invading species, then replanting with more augustine ... crab grass is a very invasive species , and unfortunatley to completley iradicate it, requires very drastic measures.. but reseading the lawn is easy, a bucket or two of seed and a couple bales of hay and peat moss. spread seed, then hay then peet moss, water liberaly , if you live in an area that allows you to let your grass grow , allow the new seed to grow at least 6 to 8 inches before cutting,giving time to build a good root system or even to a height that it reseed,s itself for the first season thereby completley cutting out the low growing centipede grass...

I've lived in florida most of my life , born and raised. and this is how my grandpappy did it

Bandidi lawn fertilizer had a NPK mix of 15-5-7. Look for fertilizers with the same NPK and it should work as well as Bandidi. All fertilizers have a NPK rating, so you can find these on all fertilizers.

Here is information on what NPK means:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/fertilizer-numbers-npk.htm

Yes, it has a tendency to crowd out other weeds and grasses. Please see this article for more info:

https://www.gardeningknowhow.com/lawn-care/specific/st-augustine-grass/st-augustine-grass.htm

Fall and spring is the best time to seed your lawn, though to be honest, with the drought that you guys are having, I would wait to reseed. The reason is that it will be very difficult for the grass to establish in such conditions. You would essentially be throwing your money on the ground as grass does best in establishing with lots of water available. That is why you wait until spring or fall. Ideal temps with higher rainfall, normally.

I know it is hard to look at a sparse lawn, but wait until the weather improves before seeding. As for purchasing, try local nurseries or even feed stores. If that does not work, there are several online suppliers that can help you.

I would wait until fall or later in the spring to fertilize to let the new turf get a good hold without possibly burning the tender roots of the newly growing grass. In fall or late spring, use a fertilizer that is higher in nitrogen (the first number in the N-P-K number). This article will help: https://www.gardeningknowhow.com/lawn-care/specific/st-augustine-grass/st-augustine-grass.htm

No grass will grow well in deep shade, but St. Augustine will have the best choice for shade and sun in a warm climate.

This article will help with giving grass a better chance in the shade:
https://www.gardeningknowhow.com/lawn-care/lgen/growing-grass-shade.htm