Hi akrieg,
Unfortunately nobody else can feel what you feel on a mattress and there are too many unknowns,variables, and personal preferences involved for anyone to be able to make specific suggestions about which mattress may be best for you based on specs (either yours or a mattress) or “theory at a distance” (see mattress firmness/comfort levels in post #2 here). The tutorial post has all the information and guidelines that can help you with “how” to choose and post #13 here also has more information about the most important parts of the value of a mattress that can help you make more meaningful comparisons between mattresses but the specifics of “what” to choose and which mattress is the best value for you is always up to each person’s individual criteria and preferences and the parts of your personal value equation that are most important to you.
If you know the specifics of all the layers in any mattress you will be able to identify any lower quality materials or weak links in the mattress (see this article and the quality guidelines here).
You can see my thoughts about the Holmsta here.
You can see a picture of the layers in the Myrbacka here and some comments about it in posts #58 and #59 here. It includes synthetic latex and 2.2 lb polyfoam which are both durable materials and there are no weak links in the mattress but I would make sure that it’s a good match for you in terms of PPP because Ikea only has a one time exchange policy and doesn’t allow returns (see here) and they may not have another mattress to exchange for that would be a good match for you in terms of PPP.
You can see some of my thoughts about Casper in post #2 here and the posts it links to. Like the Tuft and Needle … it’s an “all or nothing” choice that will either be “good enough” for you in terms of PPP or if it isn’t then they have a great return policy.
Some of the better options for latex and latex hybrid mattresses I’m aware of are listed in posts #3 and #4 here and some of the other lower budget options besides latex that may also be worth considering are listed in post #4 here.
If you let me know your city or zip code I’d also be happy to let you know about any of the better options or possibilities I’m aware of in your area as well.
Phoenix