I plumbed in IBS; when you are wakesurfing, are you supposed to fill just one of the two front bags, or both?

The other day, I filled the middle bag all the way, the front two as much as I could before the seat cushions popped, and the right corner bag all the way. I still couldn't find any sweet spot (first time surfer), but my kids seemed to be able to find it briefly anyway, with me sitting on the right corner too. Unfortunately there was no one sitting on the corner for me while I surfed...