Hi nycgal,
The first thing I would suggest it to give your mattress some time so that you have a chance to go through the normal adjustment period that goes with any new sleeping surface or a material that you aren’t used to sleeping on (see post #3 here). Latex is very “point elastic” and contouring and has a very different “feel” than other types of foam materials and can take some time to get used to. For some people it can feel softer than other materials that have the same softness rating and for others it can feel firmer than materials that have the same firmness rating and while it may not “feel” supportive … because it also has a higher compression modulus than other foam materials (the rate that a material becomes firmer as you compress it more deeply) it may actually be doing a better job of keeping you in good alignment than the mattress that you were sleeping on previously even though it may “feel” like it isn’t.
Are you experiencing any actual symptoms on your mattress (such as lower back pain when you wake up in the morning) or is it just that it feels different (or feels softer) than what you are used to?
Your mattress would certainly be in the range of the firmness level that “on average” would tend to work well for others that are in your weight range and have a similar sleeping style and I would tend to give any new mattress a minimum of two weeks (and preferably longer) before you consider making any changes. If after a few weeks your sleeping experience indicates that you either need or prefer to make a change to your comfort layer for something firmer then I would talk with Brooklyn Bedding about your experience over the first few weeks to help you decide on which firmness level would be your best choice because a more detailed conversation with a knowledgeable and experienced manufacturer will be your best source of guidance about any changes which would have the best chance of success.
Phoenix