Now that I see it it makes a bit more sense. I am going to focus on the iFrames for a moment. Why iFrame in content when you can build it natively in unbounce? That is the true power of the platform? This seems like less of a landing page and more like a micro site. If you build it completely in unbounce you’ll be able to show a mobile page, and that might be very important in this vertical.
With that said the reason the top light box has scroll bars is that it is taller than the page section. If you make the page section taller the lightbox won’t have to compress. However, because that CTA button is so dramatically different from the other two it took me a few minutes to find it.
My suggestion is to try and simplify your message, define your value proposition in the headline (which you have) but move it up and make it the focal point of the top of the page.
If you are really trying to engage with people (offering them the call back) I might skip that and use Olark to live chat with people. It is the best live chat plugin out there.
Lastly, how are you sending traffic to this page?
I bet with some tweaking you will get it dialed in. I might also recommend looking at Oli’s eBook about attention driven design. That could help clear up some of the top of the page issues for you.
Keep it going!