Using Captivate for Responsive Mobile Learning, and Sideways Phone Flipping

So my boss wants me to make a mobile learning piece as a "side project" when I'm not working on other things. At first I was using Storyline, but I came across an issue on responsiveness that I figured Captivate 9 could deal with much better, so I'm redoing the project in Captivate. Overall, the responsive features are too cool.

In my first "draft" of this mobile learning project, I used wide-screen - so the learner needed to flip their phone sideways to view the content. The reason for this being there was some content that didn't fit vertically (tables and such). However, sideways mobile learning didn't feel very intuitive. People love vertical layouts. I figured Captivate 9's responsive features would save the day. That is - I'd be able to design the course for vertical view, but then if the learner chooses to flip their phone sideways (to view a table better, for example), the layout would adopt and change.

But it's only kind of working how I want it to. The vertical layout is great and works as intended. But when the phone flips sideways, it goes to the "Tablet" view. Which is far too lengthy and requires the learn to scroll, which is not ideal.

I selected "Custom Mobile" view from the top and it automated to a horizontal resolution, but it doesn't seem to work when I look at it on my phone. It keeps going to Tablet view.

Anyone have experience with this?

Edit: Okay so when I preview it in my browser and change the size of the window, the custom mobile layout does show up. So I suppose its the resolution that's messed up? Does anyone have a list of ideal resolutions for Captivate on a mobile device?