Thanks Derek
-
To change the styles (css) of the Blog - you can add them to your templates CSS to override the pulsecore/asset/css/pulsecore.css
-
To move the Back button will require some code changes in the files - but agree this would be better below the post. We'll add this into a near future update
-
The featured thumbnail being left of the main post was because some people like to have a thumbnail post different to the first image on their blog, or no image and go straight into text. To add the same image in the post just hit image and click on it.
- For the "blog-page-header" do you mean the blog title?
I added a Header on my Blog page called "Blog Derek" and it appears on my posts:
Let me know if it's something else and we can fix/add it 
- For the admin renaming a fix will be released in 5.1 BETA5 which should be released later today. More on that here:
Some troubles in PULSE admin