Hi ewhodges,
19 ILD latex would certainly be in the “soft” range for most people.
How long have you had your mattress? If the showroom model was softer than yours then that’s usually an indication that your mattress will soften a little once it breaks in and I would tend to wait for at least 30 days or so before adding a topper or making any other changes to your mattress or sleeping system.
Post #2 here may also be worth reading if a mattress purchase is initially too firm.
Phoenix