So the Cloudflare Thumbnail problem was caused by the .mview file being parsed as a Content-Type: text/plain which had some problems with the Cloudflare Service as it is actually binary data.
So they suggested me to configuring the Apache origin to serve .mview files with the content-type of application/octet-stream.
After setting that custom type and cleared the cache the thumbnails started working!
So yea so far so good and most if not all problems are currently solved!
