You are not only drilling through just the concrete here, but also as deep as you can into the dirt. The deeper the better. Once the holes are drilled, you fill at the same rate you did the trench, 4 gallons per 10 feet. If you drilled the holes 12 inches apart, then you would have 10 holes over 10 feet that you are trying to fill with 4 gallons. This works out to be a little less than half a gallon per hole. To fill these I would recommend using the one gallon sprayer on a "pin stream" setting so you can force the liquid down the hole and not splash it everywhere. You can also use a funnel and pour the termiticide down the holes. It is difficult to get 4 gallons per 10 feet in the holes, so it is important that you use a long drill bit, at least 18" long so you can bore out enough dirt to hold the termiticide. Sometimes the ground is slow to soak up the termiticide you place in the holes. You may need to fill the holes, then go work on something else for an hour, come back and fill them again, go work on something else... 3 to 4 times to get the proper amount down the holes. Once the holes are filled all you need to do is patch them with a concrete patch filler you can buy at a home improvement or hardware store or you can use our Trebor plugs that will close the hole with no concrete mess.
Carpenter ants in FL would be the same as carpenter ants in other regions of the country. We generally recommend using Termidor SC outdoors around the perimeter of your home. This is labeled to be used every six months outdoors.
What types of bait are you using? We would be happy to make another recommendation if you have been using them for a while.
We would recommend doing a trench treatment around your home for an active infestation of termites. We have a helpful article on How to Get Rid of Termites that we recommend reviewing for the best advice.
Please be sure to read the product label of any insecticide you choose to use to get information on the needed personal protective safety gear you will need. In most situations it is recommended that you wear long pants, a long sleeved shirt, closed toe shoes with socks, chemical resistant gloves and goggles. In areas where ventilation is poor a manufacturer may recommend you wear a mask or a respirator. We have put together 2 different safety kits that will make selecting correct safety gear easier for you.