Hi marshmallow,
It sounds like you did some good testing and I’m glad to hear that you made such a good decision … and congratulations on your new mattress 
I’m looking forward to your comments and feedback when you receive it.
As far as your other comments … online recommendations, suggestions, and guidance are as much an art as a science and it’s very common that different manufacturers and people will have different opinions and suggestions for the same customer. For most people there won’t be a specific “best” mattress and there will be a range of different mattress designs that will be a good match for their body types, sleeping positions, and preferences. Outside of their body type and sleeping positions … the range of mattresses that will be suitable for each person will also depend on their sensitivity where they are in the range between “princess and the pea” and "I can sleep on anything. Post #8 here discusses this in much more detail.
Ken who is the owner at Arizona Premium (Greg is his employee and doesn’t have the same experience) and Henry at Flexus both have decades of experience with latex and I have a very high regard for their judgement just like I do with Shawn at SleepEZ. I certainly wouldn’t be giving any of them any “lessons” … even if they had different opinions about something … when they have many years more experience working with customers than I have. I have learned a lot from all of them over the years.
Phoenix