There was actually a bug in earlier versions, and edtFTPj/PRO is now producing the correct result.
The default perms are 777, and the default umask is 022, giving 755 default permissions.
With a umask of 027, you get -rwxr-x--- (750), as expected now.
If you want to get permissions of -rw-r----- for newly created files (640) , you need a umask of 137.