Hi regmattress,
You’ve probably read this with all your research but just in case you haven’t and since you are in a heavier weight range … there is more information in post #3 here that would be helpful for those that are in higher weight ranges.
It seems though that you are already aware of and know the importance of more durable materials for higher weight ranges and all of the mattresses you are considering use higher quality materials that would be suitable for your weight range.
As long as the materials in a mattress you are considering are durable enough for your body type and meet the guidelines here … the choice between different types and combinations of materials and components or different types of mattresses (see this article) are more of a preference and a budget choice than a “better/worse” choice.
In other words … one type of mattress isn’t inherently better or worse than another as long as a mattress you purchase is a good match for you in terms of PPP, uses good quality and durable materials, and compares well to the other mattresses you are considering based on all the parts of your personal value equation that are most important to you.
As you know Christeli makes memory foam mattresses (even though two of their mattresses use latex support cores they are still primarily memory foam mattresses since you would be sleeping on memory foam) and the Dreamfoam Total Latex Mattress is an all latex mattress so these are very much an apples to oranges comparison that would be a preference choice. There is more about the pros and cons of memory foam vs latex in post #2 here but the most reliable way to know which types or combinations of materials or which types of mattresses you tend to prefer in more general terms will be based on your own local testing or personal experience.
I was about to link the last post you linked about the benefits of the latex support core in the Lux Estate but then I saw that you had already read it. It would certainly have a durability advantage even over 2 lb polyfoam in a mattress for those that are in higher weight ranges like yourself and while it would also have an effect on the overall “feel” of the mattress … it certainly wouldn’t ruin the “feel” of the memory foam comfort layer. It would add a little bit more resilience or springiness under the memory foam which some people may prefer.
While your own careful testing or personal experience is the most reliable way to know whether a mattress is a good “match” for you in terms of comfort and PPP … when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Again … I would always keep in mind that no matter how much research you do the only way to know with any certainty how any mattress will feel for you or whether it will be a good match for you in terms of PPP will be based on your own personal experience.
You are certainly looking at some very good choices but once you have narrowed down your options to a list of finalists that are all choices between “good and good” (which you have) and none of them have any lower quality materials or “weak links” in their design (which they don’t) and if there are no clear winners between them (which is usually a good indication that you have done some very good research) then you are in the fortunate position that either of them would likely be a suitable choice and post #2 here can help you make a final choice based on your local testing or mattresses you have slept well on, your more detailed conversations with each of them, your confidence about PPP and the suitability of each one, their prices, your preferences for different types of materials, the options you have after a purchase to fine tune the mattress or exchange or return the mattress or individual layers, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
I’m glad you didn’t give in to the temptation to purchase one of the Dynasty mattresses since both of them probably wouldn’t hold up very well with your body weight.
I’m looking forward to finding out what you end up deciding once you pull the trigger 
Phoenix