You can put firmer cores in and build up the crown of the cushion to get it so there is no puddling, and it will be like sitting on a beach ball when you go to that extreme. There is a balance to be achieved between comfort of the chair and resilience of the core / fullness of the crown in the seat. I see nothing excessive in that photo for that recliner.

If you have made up your mind this is an issue, then nothing I can tell you is going to change that - good luck.