Repeat Customer - Need a better Solution for Bed

Hi Ken,
A few questions and backstory:

Back in 2013, my husband and I purchased a twin XL for our guest room from your company. See pic attached of the label off of the mattress. The mattress is fine for an occasional visit from our adult daughters, but not suitable if either one of us needs to retreat to the guest bedroom in the event one of us has a cold or is snoring. The twin XL is way too “squishy”. If sitting on the side of the bed, the mattress caves in and one slides off. It’s also pretty bouncy. We have tried flipping the mattress so that the firmer side is up and the topper is down, but the fact remains that this mattress does not have a stable, supportive core. Would it be possible to purchase a firmer latex support core in twin XL along with a zippered cover so that we could improve the support? What ILD do we currently have for the bottom and the topper?

Second Issue:
We now find ourselves needing to replace or remediate our latex queen 8" mattress purchased 10 years ago from an online store that was named “Tranquility”. The product was advertised as their “plush” model. I do not recall nor can I find the paperwork for this bed that indictes what the ILD is of the core and topper are. Our queen bed has excellent core support, but it is too firm to sleep without the addition of a memory foam topper. We have tried a 3" memory foam topper which caused us to sink in and now have a 1.5 inch memory foam topper which my husband thinks is just perfect, but the bed is too firm for me and I wake up during the night due to pressure in shoulders, hips, and legs. We are both side sleepers. I think our bed would probably be very good if it had a comfort layer.
I am wondering if a latex topper would be a possible solution for our queen bed on an adjustable frame or if we should just start over instead of sinking hundreds of dollars on a latex topper that may not work. Our latex bed is 10 years old and we are also thinking that it might be time to size up to a King. What are your thoughts?

Thank you so much. We look forward to hearing your recommmendations.

I need your name to look up your order. Does the TwinXL have a zippered cover? I think for your queen bed you just need a dual firmness topper. Perhaps a 2" Medium or Firm for his side with a Soft for your side. We can do that with latex.

May I have your email address so that I can order topper? My Oder for the twin XL was under Campbell in 2013. I would want to avoid this config for our next upgrade to a split king. Thank you so much!

website is www.mattresses.net [email protected] for email.