Hi Justin
From the sounds of things, you have no where to go but up, honestly.
You've listed the following:
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More valuable content (FANTASTIC!)
 
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Updating title and meta tags (FANTASTIC!)
 
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Yes, they do matter
 
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Title tags are one of your most important (if not, THE most important) onsite SEO ranking factors
 
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Meta descriptions, while not a ranking factor, are a great "first pitch" to searchers and can increase CTR - use them
 
Are these 3 top level domains going to be all the same content? Or are they going to be their own standalone sites? I would be extremely mindful in that situation as you could run into a major duplicate content issue. Mind your canonical tags as well as (possibly) "original-source" meta tags if necessary.
Hope this helps you, let me know if you have any questions, but it sounds like you are making some good moves here. Good luck!!!