Recommendations for large (300lbs) back/side and smaller (130lbs) could

Hello.

I am looking for some advice. I currently have a Costco Avocado Hybrid mattress, with a 4" dunlop topper on it. I tried it without the topper and though my back was better aligned, it was too much pressure in specific spots.

The Costco Avocado replaced an almost 4 year old Casper hybrid. The Casper wasn’t bad, though I could feel pressure points after almost 4 years. The upgrade is mostly because I went from queen to king ahead of my wife arriving in the US.

I thought I was getting a good deal, since the Avocado was 400 dollars off. But then I did some more research and it looks like it probably won’t support me properly over time.

I considered upgrading to the green, but then I had heard that they change the spring layout / design since I tried one out at their showroom. I guess they use thinner coils now.

AI keeps pushing me towards Saatva HD, citing its strong coils and zoned support. But I have seen mixed info about them. Many reviews say they are great.

Is there a better option for me? I am within the return window for both the Avocado Mattress and the Dunlop topper. I am in the Philly suburbs so I could try stores like Raymour that have the Avocado and others, and I could also make a trip to the Saatva showroom to try the HD.

I have also heard both good and bad things about the Titan plus elite.

Can anyone help me find the right mattress for me and my wife? Am I just in a position where I am better off just replacing it every couple of years with a new cheap Costco mattress? Is there a premium mattress that might work for both of us and last a long time?

Thanks!!!