Yard infested with crab grass and dallis grass

Celsius is killing neither of those weeds. Certainty would likely be your best option I think.
certainty herbicide

Dallisgrass is very resilient. I've eradicated it before by repeatedly spot treating with roundup. I've found it's best to start on it early as possible in the season and repeatedly hit it with roundup until it's gone. One hit at the end of the season and it will likely come up from the root again next spring.

Nuke it with MSMA

for dalisgrass

This is why St Aug sucks.
You need Quinclorac for crabgrass and St Aug can’t handle it.

If you care enough, Start over with Bermuda or zoysia.

This is a fun little tool to remove the unwanted grass. For stubborn weeds, do it after a rain.

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crab grass and dallis grass. My yard is/should be st Augustine.

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Not many options for St Augustine. MSMA kills it but from what I've read it'll also kill St Aug. Great for Bermuda Lawns, though.

I've spot sprayed with glyphosate in the past, but you have to deal with ugly dead spots for a while.

I recently purchased some Recognition Herbicide ($$$). Combined with Fusilade II ($$) it kills bermudagrass and protects the St. Aug. So far it is working well on the bermudagrass and it is also hurting the dallisgrass pretty hard. I plan on doing another spray here soon and I'm hoping it finishes off the dallisgrass. From what I've read it should take care of it.

See this thread for more details.

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I recently purchased some Recognition Herbicide ($$$). Combined with Fusilade II ($$) it kills bermudagrass and protects the St. Aug. So far it is working well on the bermudagrass and it is also hurting the dallisgrass pretty hard.

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I'm running this as well trying to finally get rid of Bermuda. It's working but I can tell I'm going to need multiple applications throughout multiple years of this chemical. What are you doing to make st Augustine spread to take over the dead spot of Bermuda?