Hi Christina, nice eagles, such a majestic bird. A couple things I noticed... your 300mm lens with the crop factor of the camera sensor of 1.5 give you an effective focal length of 450mm. You then add the 1.7 tele- converter and the focal length is 765mm. Arthur Morris addresses that here in his blog regarding the new Canon 7DMKII...
http://www.birdsasart-blog.com/ About half way down the page.
Also, why are you using Unsharp Mask in Photoshop instead of the sharpening in Lightroom. Just the Masking slider in Lightroom would take about 20 steps in Photoshop to create the edge mask. I so almost everything in Lightroom now, only going into Photoshop for Cloning and Content Aware Spot Removal.
Anyways, keep shooting and enjoying