Hi Southie,
Welcome to the MattressUnderGround and now you are officially and affectionately know as a MUGster.
Thank you for your service! 
I just competed a response to another MUGster, so I am going to take the fast track here and link you to that post. Much of what was stated can be translated to your situation, but with their all latex models.
While your body types may differ slightly and your preference leans towards all-latex, it’s important not to overlook the fact that I was recommending a hybrid to this couple after their unsatisfactory experience with an all-foam mattress. Now, I’m inclined to suggest an all-foam mattress for you and your wife, taking into account your experience with your current hybrid mattress. Although, I would not discount a hybrid.
The reality is that most companies mentioned offer nearly identical mattress choices, with a shift towards their all-latex and natural fiber options. Some exclusively offer hybrids, which you would naturally eliminate given your current preference. However, it’s worth noting that these hybrids are of superior quality, and I believe your experience may differ from your previous hybrid mattress, should you choose to explore them again.
As I’ve mentioned before in the previous post, all my latex “friends” here on The MattressUnderGround staunchly advocate that all-latex mattresses, with the correct selection of support, comfort, and cover layers, can offer even the most discerning sleepers a nice, comfortable surprise. I recall a post from one of our Trusted Members who mentioned that when customers come into their showroom looking for a hybrid mattress, they often test the all-latex option and fall in love with it.
While SoL offers a nice mattress, the distinct advantage most all of the mattresses mentioned in the linked post have all latex options, with customizable features that can be augmented in your own home by simply swapping a layer, rather than returning an entire mattress. Many of these mattresses offer both manufacturing styles of latex, to that can target specific areas of customizable pressure relief and contouring.
You seem to have done your research regarding the slat spacing, for all latex and even most hybrids, 3" and under are most desirable. A sturdy foundation with appropriate center support is crucial for comfort and longevity of your mattress.
All of our Trusted Members deliver anywhere in the continental US, so rest assured with a bit of collaboration with them, they can guide to the specific combination to meet your needs. And you should feel confident that even though it may be a long distance assessment, they are successful more than 90% of the time on the first attempt.
The height of your mattress is an important consideration, but taller doesn’t necessarily mean more comfortable, firmer, or softer. In your case, it might be more about accessibility, depending on the challenges you face. I recently purchased a mattress and an adjustable base for my mother-in-law, who has various health issues. I chose an adjustable base with customizable height options, which was very helpful because it was difficult for her to get in and out of the mattress when it was at a taller height. Lowering it by 6 inches made a world of difference. Additionally, the adjustable base’s massaging feature and head and foot articulation provided much-needed relief for her swollen ankles and poor circulation.
I would encourage you to take a peek at that post and the pillow post to reinforce your search.
If you have any specific questions for any Trusted Member, you can always use the @ symbol as a prefix to their name and it will alert them to your question. Something like this @Sleep_EZ since you mentioned them in your post.
Please feel free to float further questions to any Trusted Member or me as we are always here to help guide you to a successful mattress match here at the MattressUnderGround.
All the best, and again, Thank you for your service!
Maverick