need help finding mattress

Hello,

My wife and I had been on a 24 year old plush Serta Perfect Sleeper (flippable, inner spring, polyfoam). For some reason it worked for us (my theory below) but we are having trouble finding a replacement.

We don’t like memory foam or a hybrid with memory foam.

Here is what we are realizing we like:
want to be “on” not “in” mattress
want good responsiveness and ability to reposition easily
want good edge support (no polyfoam piers or polyfoam encasement)
want to sleep cool (most of the year is hot and humid in eastern NC)
want good bounce
want good motion isolation (know this is less likely with innerspring but want to minimize)
want edge to edge coils
want tight top (no pillow top)
prefer no zoning (or just 3)

Here is our info:
I am 6’ around 180lbs; wife is 5’4" and around 180-190lbs.
My wife is a stomach sleeper (she doesn’t mind soft as long as she doesn’t have to lift up to reposition).
I am a side sleeper (need pressure relief for hips and shoulders).

After doing the tutorials on TMU and other research/mattress trials, I am narrowing on three types: 1) a flippable polyfoam innerspring, or 2) a 100% natural latex without fillers or GOLS in either three layers of all foam (preferably a customizable do it yourself with zipper cover), or 3) a flippable/two sided with latex over an innerspring but no polyfoam at all to get full benefit of longer latex durability.

Given our normal sleeping positions we are at opposite needs my theory as to why the old mattress worked is because it was only about 11" thick so it likely didn’t have too much padding for my wife’s hips to sink too far. Also, since it wasn’t pocket coils (I would guess a Bonnell or open-end offset system) perhaps that too supported my wifes hips. For me, I think the 2" or so of polyfoam probably drew pressure relief from the coils which I suspect were softer on initial compression then firmer on deeper compression. Once the foam was shot the coils were soft enough for comfort.

So here are my questions:

  1. What would you recommend we look for in a mattress for a good fit for us in general and what specifications for components? Which of your product line suits us best?
  2. Does 100% natural latex have fillers like clay and feldspar if it isn’t blended with synthetic? If so what is the percent filler?
  3. Is it standard for latex warranties not to cover small cracks and tears? I would think such cracks and tears would expand and deepen over time, esp. when rotating layers.
  4. Where is the latex manufactured? Should I prefer North American manufactured latex?
  5. I have seen some hybrid latex, one sided mattresses with no base support layer of dense foam under the coils. The quilted mattress cover appears all the coils sit on. Is that not a bad design?
  6. Is a warranty that goes prorated after just 1-2 years a red flag? 5 years?

Thank you!