Hi Winnipeg Seeker,
I'm glad you found us ... and it's fortunate that you have one of the best quality and value manufacturers right in your city
The best advice I can give you is to listen to your body when you go to test mattresses and focus on giving Harry at Restmore the best possible feedback when you are lying on mattresses. He has the experience and knowledge and knows all the options available to suggest any changes based on your feedback so you only have to focus on what you are feeling in terms of pressure relief and alignment and he will know what to do if anything needs changing.
Post #11 here
may help you in testing alignment which is a little more difficult than testing for pressure relief which is more obvious.
The materials and components you are looking at are good quality and there are many people whose favorite mattress is an innerspring/latex hybrid. Blended Talalay is also a great material and if anything can be more durable and pressure relieving in softer ILD's than natural Talalay (see
this article
about the different types of latex).
I would probably tend to choose a stretch knit cover with natural fibers like cotton or a "semi-synthetic" viscose ticking like bamboo and I would also consider wool quilting (although it may be more) because of the ability of natural fibers to control humidity and regulate temperature and a stretch knit will conform to the latex well but again your body will tell you what feels the best.
It seems to me that you have done some good research and I think you already have a good sense of the basics (a little thicker and softer for your lower weight and wider shoulders to sink in enough and possibly zoning to help prevent your pelvis from sinking down too far).
It's just like getting fitted for a custom outfit ... if you focus on how it feels and give them good feedback ... they have the knowledge and expertise to make the suggestions and the tweaks to make it the way you want it
You are going in a good direction IMO and I hope you let us know how it goes.
Phoenix