Hi Sam and welcome to the Mattress UnderGround. We are happy to have you and can now affectionately call you a MUGster.
It is concerning that you have had these missed experiences over the past year.
Let’s take a look at some questions head on. I am not certain if the nested coils on the Nordic are zoned, but in many cases, manufacturers opt for zoned coils where the perimeter coils are firmer than the body of the mattress. Many folks prefer this as it prevents roll off.
If your mattress came with the European style flex slat system foundation shown here, I would suggest placing the mattress on the floor for a few nights to evaluate if the “soft center” on the Nordic resolves itself. If it does, the base is your issue. It may be that the perimeter of the mattress is resting on the edges where it is firmer do to that area not being on the flexible area of the slats. If you went right to the adjustable base from mattress firm, that are some things to take into consideration.
Additionally, it’s possible that a lack of a middle support beam on your mattress base could contribute to this feeling. A middle support beam can help distribute weight more evenly across the mattress, reducing the likelihood of sagging or unevenness.
Furthermore, mattresses with softer comfort layers, such as memory foam or latex, may be more prone to this sensation, especially if they’re not adequately supported by a sturdy base.
Adjustable bases can also affect the feel of the mattress. When the base is adjusted to certain positions, it may put more stress on specific areas of the mattress, potentially leading to uneven wear over time. Particularly with the Nordic having two sets of microcoils and three separated layers of latex.
Given that you’ve experienced this sensation across multiple mattresses, including both firm and plush ones, it’s worth considering whether the base and adjustable settings might be contributing factors.
Depending on the adjustable base you have, and nothing again Mattress Firm, but the bases they give for free or on promotion, rarely give the biggest vote of confidence for the most supportive adjustable base units. Some adjustable bases are made with a wooden deck like this one while others are made with a wire base with a cover like this one. Very significant difference in support and a potential reason for dipping in the center, and causing harm to your mattress.
If you’re currently enjoying your new European Sleep Works mattress overall, it might be worth experimenting with different base settings to see if you can mitigate the feeling of sinking in the center. First I would place the mattress on the floor to see it that firms things up. If that is not possible, I would disconnect the base from its power source and place a piece of plywood on top of the adjustable base to create a very solid but sturdy base. Next, I do have concerns about the 30ILD of the latex. Someone with your profile might need a higher ILD. For reference, I am 6’ 220 (formerly 250+) and my comfort layer is a 36ILD as I like a firmer mattress. At 270 a 30ILD even 3 layers, 8 inches from your support spring layer, simply may not be firm enough support for you. I would call ESW and find out the gauge of the spring support and if the latex layers can be changed. But I would do this after you have either added the plywood to the adjustable base (with the base unplugged) or having tried the mattress on the floor first.
Also, the distance between you and the support layer is at least 8" - 2 for each layer of latex and presumably 1" each of microcoils, plus the quilted stretch knit cover. Keep in mind, that your cover affects the feel of the mattress. A stretch cover allows the foam layers to expand, allowing for a softer more plush feel, while a tight knit non stretch cover will create a firmer feel to the same mattress build.
Hopefully, this will offer you some food for thought. I would work through a few of the steps suggested before abandoning the mattress for another.
Maverick