Hi TiredinLaffy,
That’s “good” news because it means that a topper will help and that the issue is not a support issue.
I’m glad I asked because at first it sounded like an issue of the mattress feeling too soft rather than too firm.
The old version of the Beautiful has 3" of 19 ILD and then 2" of 24 ILD over the base layer and the new active fusion version probably has 3" of 21 ILD Talalay GL and then 3" of 24 ILD.
Your mattress has the 1.5" soft quilting layer then 3" of 24 ILD talalay latex
There are some topper guidelines in post #8 here and in post #4 here for choosing a topper based on your own experience and body type because there isn’t really a way to know for sure when you can’t see or “feel’ what someone else feels on a mattress. It may also depend on which version of the Beautiful you tried. If I had to guess though based on your “Beautiful” experience I would guess 2” of 19 ILD would have the best odds of success (subject to modification based on the version of the Beautiful and your own “best estimate” after reading the guidelines).
Phoenix