Upload & Sell: On
I agree with Tony. Putting a TC X2 on the lens deteriorates the performance of any combo. More so when you use it for IF shots as the focus speed decreases sensibly.
I never use a TC (Tele Converter) for my IF shots, I use a 1,4 TC only for stationary subjects and the 2 TC in emergency
While the IQ of the first image looks fine, the rest of the images look soft with a lower IQ, and since you seem to have adequate SS, I'm thinking is that it is due to inadequate focus precision, soft focus, so it doesn't matter how proficient you are in your PP, the images will still look soft. Go easy with the sharpening though. Your last image shows a very visible halo due to oversharpening (and heavy crop?)
My advice to improve your IF shots is to take out the TC and see how your captures will look like. The 7D allows some good cropping.
Use the expansion AF when you shoot against the sky, only the center focus when you shoot against a busy bg.
Leave the camera at its default setting (as far as the Focus performance it concerned) and see how it goes, than change one setting at the time and see if your keepers rate improves.
Another advice is, if you can effort it, to use a 400/5.6, probably one of the most suited lens for IF captures.
Most of all, practice, practice, practice
In the mean time if you have specific questions about any setting of the 7D, or the use of LR5 don't refrain to ask. You can p.m. me if you like.
Keep practicing and have fun!