That´s the reason why i ask you about all informations!
PHP-FPM makes you able to set the values per domain!
Do you also use our PHPSwitcher Plugin?
If not, you should be able to change the values for each domain here: /etc/apache2/sites-available/domain.tld.conf
After you change the value, you have to restart the apache2 service with service apache2 restart
If you use the PHPSwitcher Plugin, the directory and service is different.