Meta Scraper Add-on at scale ?


Hi have a problem with the Meta Scraper Add On. 
Imgur trying to scrape 1533 Keywords and I get only 500 results.

Afterwards I renewed the proxies, put delay on 30 seconds and switched connections to 1 and I get 900 results, but it doesn’t stop (start button greyed out), it simply does not go on.
Afterwards I checked the proxies and all of them passed both tests.
What am I doing wrong ?