We seem to be in an almost the same boat – almost same weights, sleeping positions, same current mattress problems, same new mattress preferences, same budget, at the same pre-purchase stage…
You may be interested to check our thread at https://forum.mattressunderground.com/t/dunlop-vs-talalay-for-a-heavy-person
We are looking forward to following your thread as the situation develops… Good to know we are not alone.