Hi Mike in FL,
There is a little more information in post #2 here that may be helpful if a new mattress you purchase is too firm for you (although I would always wait at least two weeks before making any layer changes unless it’s impossible to do so).
There is also more information in post #2 here that talks about the various symptoms that people may experience on a mattress and some of the reasons that can cause them that can help with the detective work or trial and error that may be necessary to identify the types of changes that may be helpful.
The best source of guidance though will be more detailed conversations on the phone with SleepEZ.
I would be very cautious about adding things like pads and blankets on top of the mattress because while it may help a little with surface softness … it can also interfere with the ability of the latex to contour to the body which can make it feel firmer as well so you can end up with a somewhat confusing situation where you have a softer sleeping surface but a firmer mattress and less pressure relief overall once you sink in past the layers you have added.
The most effective approach if you are “outside the averages” and need to do some fine tuning to your mattress is to take a “one step at a time” and more incremental approach that only makes single changes at a time (rather than multiple changes) and then make sure that you sleep on each new combination for at least a few days to help confirm that your experience and how it changes is more of a “pattern” than an “anomaly” so you can use your experience with each change and what you learned from the results of each change (the specifics of how it was different from the last combination) to help you decide on the next change that has the best chance of moving you in the direction you want to go based on your “symptoms”.
If the only issue you are having is shoulder numbness and you have no alignment issues then either changing your pillow, sleeping more directly on the latex so there are less materials over it that can affect how it contours, going a little softer in the upper layers, or adding a topper would all be ways that have led to success for many people in a similar situation.
Phoenix