Have you tried doing the section in the FAQ where they talk about “I can’t get into my admin panel. How do I fix it?” and “How do I reset the plugin’s settings”?
Have you tried turning the plugins off one by one to see if it’s being caused by one of the plugins? You can also try changing the theme to see if it is a conflict with the theme.
After you ban the ips, do you go to the banned ip (I think that’s what it’s called) and permanently ban them? You can also ban networks. Here’s a post from the Wordfence site:
Your site is beautiful.
Does the slider automatically resize the images? The ones that are the correct size have the file name, then -150×150.jpg. The ones that are too big don’t have this in their file name.