Hi treje,
I would follow the same guidelines as anyone else using the mattress testing suggestions in the tutorial post which will “bypass” theory which can become much too complex for practical use. Nobody else can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved for anyone to make suggestions for someone else based on either specs (either yours or a mattress) or “theory at a distance” (see mattress firmness/comfort levels in post #2 here). Having said that … in many cases lighter body types will lean towards softer materials than heavier body types because they won’t sink into a mattress as easily but what may be true “in general” isn’t always the case when it comes to any specific person.
If you follow the steps in the tutorial post one at a time you will have the highest chance of making a successful purchase.
The better options and possibilities I’m aware of in the Baltimore area (subject to following the steps in the tutorial of course) are listed in post #2 here.
Phoenix