Hi Mike!
For best efficiency/optimization, we suggest using just Gutenberg, you can do a lot of things just using this.
However, if you must use a builder, the builder that I think most people use with PokaTheme is Elementor, so you could maybe give it a shot.
Also, if you must use Divi, this should also be compatible with PokaTheme. The situation you describe (everything in the middle and looks bad) may be because of some fatal error that is happening and the site “breaks”, so it would help us if you could send an email at support@pokatheme.com with access to your site to enable Divi and see if there is actually and incompatibility with PokaTheme.
Thank you!