"which of course makes it harder to rank for key terms since they don't exist now in the meta title"
This is incorrect. The keywords are still in your meta title. Google isn't going to ignore them for crawling/indexing purposes based on what it chooses to display. They're still in your code, still getting crawled, still totally counting.
That said, if Google thinks your title is irrelevant, doesn't match the search query well enough, etc., it will display something it deems more appropriate given the page content and searcher's query. Take it as Google's hint that your titles may need some improvement.
I agree with seowoody that you should include your branding in your title line. I'm less crazy about John's suggested title tag. I used to work for an agency that specialized in lawyers of various stripes, and I know how the competitiveness really pushes hard into the gray there, the niche is so badly overoptimized, but it just looks spammy when the second kw just repeats 2 of 3 words from the first kw... and as you've discovered, Google may replace it anyway. I would use keywords but write it for the client, like "Estate Planning Attorney in Mt. View - Duree Law".