Hey Mitchsie.
Welcome to our Mattress Forum. 
Did you have pain on this mattress as well, or was it working for you until the materials started to break down?
I’d suggest reaching out to @Sleep_EZ directly and sharing with them everything you’ve shared here. They’ll be able to guide you towards what they feel may be a best fit for your needs!
You may also find it worth visiting Mattress To Go whose owner Jeff Scheur has a lot of experience with higher BMI sleepers and offers a number of mattresses for consumers experiencing muscle aches and pains.
For someone of your stature, it’s likely a thicker comfort and/or transition layer is going to make a big difference for you here.
There is also more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of PPP in post #2 here that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for once you actually sleep on your mattress.
NikkiTMU