VSFTPD – still having permission issues

I'm running a Linux Ubuntu 16.04 TLS server and I have a game server installed there. In order to install plugins and manage all my server configuration files, I had to choose for a FTP server, on this case, VSFTP.

The issue is, however, I'm able to create new files and delete existing ones. But I cannot perform these actions/have these issues:

• Deleting files only works sometimes. Most times deletion operations fail and I'm forced to use SFTP to delete them, or SSH with the rm command.
• I can't delete recursively files and subfolders from a main folder, sometimes after trying to delete them they become hidden files and I'm forced to use SSH to remove them with rm -rf
• When I upload files and folders, they copy recursively, however, with the wrong permissions, such as 266, making me unable to edit and see the recursive files and folders unless I use my root SFTP.

How can I fix these issues? I'm almost newbie to this.

Here's my VSFTP configuration file (/etc/vsftpd.conf)