Howdy, @danielprague! Thanks for writing in…your images are that large because you have a very wide main content area on your website in addition to using a single column layout for your blog with the “Integrity” Stack selected with no sidebar. If you wish for this to be reduced a bit on your blog index, you can try going to Theme Options in the Builder and going to the Blog section and updating to Masonry for the layout and then selecting a column count. The other option would be to reduce your overall site width in Layout And Design in the Theme Options.
As for the YouTube videos, there are a couple options. If you’re just featuring one video in your post, we would recommend using the Video post format in the WordPress backend, and then adding your embed code in the meta options as shown below:
When placing your embed code in that text area, it will be featured in a more prominent spot on your posts, as well as showing it on the index (an added benefit). As for your videos in the post not displaying properly, we would need to review your install directly as videos in the content should get formatted properly so that this doesn’t happen. If you want us to do this, you can add your login credentials in a secure note so that only our staff can see it and we can check out what might be going on.
Cheers!