You're listening on the long wall and your width is 15 feet or so. That's kind of a short distance, relatively. I'd think you'd need a speaker that can pull off a full range sound in that configuration. With that in mind,
I've been interested lately in Eminent: http://www.eminent-tech.com/index.html?fwd=LFT8.html
These speakers sounded good when I heard them. They're big and heavy but you might consider Legacy https://legacyaudio.com/products/view/signature-se
Devores might be good, too.