WordPress file ownership and Permissions

Hi I am running a local server running Ubunto 16.04LTS with a stock LAMP
install that runs stock Apache.

I have an install of WordPress under
/var/www/vhost/{vhost-name}/public_html

Here is my problem.

I can either FTP or WordPress can edit / remove file. I cannot do both.
Not sure why.

To allow WordPress to modify files I must: (I cannot SFTP)

     * chown -R {my-user-name}:www-data www/
     * chmod -R 755 www/

To allow me to SFTP I must change the file ownership: (WordPress cannot
modify files)

     * chown -R {my-user-name}:www-data www/

I would like to be able to FTP and allow WordPress to modify files.

Any help much appreciated.

Thanks!!---------------------------------------------------
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