I doubt it. The titles aren't hidden at all. It looks good as you said, but it's not purposefully hidden at all.

As you said, there are many reasons as to why you're seeing dropped listings. You're targeting competitive keywords. Perhaps you should try to run a link audit on different websites on page 1 for your targeted terms and see what's going on with your competitors. Maybe they have a better (or worse) linking strategy or social share strategy than you?

Have you done a keyword density check on your site? Try to keep keyword density to around 1-3% (that's what's worked for us in the past).

Of course there are also the fundamentals: make sure you have keywords in all the right places (which it seems that you do - maybe consider putting keywords in the URL).

Hope this helps.

Agree with Brady & Adam on this one. Each great responses.

I'll just add that, for the most part, the URL should be for the user first and then the search engine. A lot of times brands have funk looking URLs that have numbers and symbols in them - not user friendly. So, I'd recommend adding your descriptive keyword/producA/B/C into the URL if it'll help the user understand your product and navigate your site better

Hope this helps!