Curator only pulled in 25 Posts. Can I go back further?

In short, No you can't go back further :( 

Unfortunately, due to recent API changes, this is no longer possible for Instagram, Facebook and Twitter.

We limit this first update to reduce strain on our servers the first time a source is created - Some hashtags have thousands upon thousands of photos.

Our Instagram Business Account Source offers a wider window for post retrieval, allowing it to pull posts beyond the 24-hour limit. Although there is still an initial limit of 20-25 posts when the source is first added, those on paid plans can contact us at support@curator.io. We can attempt to forcibly or manually pull additional posts that were not included within the initial cap.