The G633 is like cardboard. I'm not surprised you didn't find it comfortable.
Try the Beyerdynamic DT770 pro 250ohm with the velvet ear pads. You'll never go back. Buy the mic separate. The headphone+mic scene is a joke.
It's similar to the Clouds, so you might be able to purchase the velvet ear pads and swap them out. Although I don't know if the drivers and tuning are similar between the Cloud and DT770s.