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Hi Nick,
There could be many factors affecting this, are you able to provide more details (Key term, what page is ranking, etc) you are having the issue with? With a little more detail some of the intelligent folks here could offer some suggestions/theories.
We have been using it in tandem with a rather aggressive local campaign for clients. We have yet to see the results show up in the knowledge graph (links to social) but all of our properties perform very well in local searches. Hard to tell if it's just this part of our campaign that is causing it or the sum of all of the parts.
As for investing extra costs. If you are using Google Tag Manager (GTM) and doing schema with JSON-LD, it is an investment of 15 minutes. Very little cost for a potentially great pay off. If you aren't using JSON-LD in GTM I would suggest the switch, it saves a huge amount of time.
We agree with Eric, I would also explore setting Href Lang tags. Check out https://moz.com/blog/hreflang-behaviour-insights and use Search Console to trouble-shoot the effort.
Although we always recommend against onload pop-ups for clients, (we feel the effect the user experience) we do have a few clients that insist on them. I was reading this article the other day https://searchenginewatch.com/2016/05/17/how-do-i-make-sure-my-site-is-mobile-friendly/ which lead me to https://support.google.com/webmasters/answer/6101188 and I'm happy to see that Google is going to consider these types of content a downgrade when it comes to rank. My question is 2 fold:
We haven't noticed any drops yet but it is something we will be keeping a close eye on in the next little while.
Let's hear what the community has to say 
Google is penalizing for spammy schema markup, (see: http://searchengineland.com/spammy-structured-markup-penalty-recovery-use-schema-markup-caution-223289) So if it's an error because of incomplete information, I would keep it as a product.
Odd, are you seeing any errors in Google Search Console (use to be Google webmaster tools) under Search Traffic/International Targeting. It will show any hreflang errors, I would start there and fix any errors.