Oh. Dude. Wow. I'd be jumping to do something, too, with that history. A couple hard hits in as many years and that can definitely spell trouble.
You got some good stuff though. Garden Safe is a good brand. I went to their website and looked at the label info - 98+% Bt. That's VERY good. As good as the Monterrey. But changing up brands for the next treatment if needed is a good idea anyway.
Other than that, keep the tree as healthy and happy as possible. You may already know the following, but I can't help but say...
Get some liquid seaweed and drench the ground with it according to the package directions. It has plant stress hormones in it as well as lots of micronutrients. When a plant experiences an injury, it takes some time for it to make enough stress hormones, and it can't start healing until it gets enough stress hormones. Giving it seaweed will speed up that whole process.
Make sure they get enough water. If no rain in a month, throw a tuna can out there and use a sprinkler until it's full, then move the sprinkler and can around, and again, until the entire ground under the canopy has been covered. Don't be tempted to do more than that - they don't have many leaves, so won't be using near as much water as normal. They transpire moisture from the bottom of the leaves, mostly when they're making food, and leaves make food - so few leaves means little food making or transpiration.
If you want to go hog wild, you can spread a half inch of compost all under that tree canopy, too. Don't do much fertilizer if any - just the compost. Compost is like chicken soup when you have a cold, fertilizer would be like a chicken fried steak, mashed potatoes, gravy ... tasty, but not what you really need. (Btw, that seaweed? A hot toddy - bourbon, lemon, and honey. Mmmmm...).
And keep babying them for a year. They need all the help they can get to replenish the food stores in their roots. Those food stores down there are a lot like bees putting up enough honey for winter. They need that energy to put on new leaves in the spring. They'll use up some of them putting on new leaves now, then use a lot more next spring. They'll need all the help they can get next year to replace all that to the point they have a surplus again.
Good luck, man. I hope you don't lose them, but I don't think you will. I think they'll bounce back. I've seen ones in worse shape do it. That drought's done awful things to our trees, too, and I'm amazed at how many survived that looked as bad as yours. Yeah, they lost some of the outer portion of their limbs, but they were still there and are almost back all the way now.
Holler if you have any more questions.
