Hi Ginger,
Don’t forget that support comes mostly from the deeper layers in your mattress rather than the top layers (and the Pamper has a very firm support layer).
I’m not sure which version of the Pamper you have. The old one has 1" of softer 19 ILD Talalay in the comfort layer and the new one has 2" of Active Fusion fast response Talalay (which would be close to the same softness).
If your topper is from PLB … then it would be very soft (probably in the 14 - 15 ILD range) which means that you could be “going through” this and the 1" layer below it and feeling the firmness of the support layers. If you were to use the same thickness but a firmer topper it may be enough to stop you from going through as much but of course the surface feel would also be firmer or you may need a little extra thickness (side sleepers are typically in the 3" to 4" comfort layer range) but this would depend on body type and the other layers in the mattress). Some people who were lighter would even be OK with the 3" you have in the comfort layers (1’ comfort layer if you have the old Pamper and the 2" topper).
Again your body type and weight will be a big factor in how firm a foam feels for you but for most people a 32 ILD layer would be firmer than they would prefer (and it most likely would be much less “cushiony” than the topper you have. It would be a significant change and quite an adjustment from your current topper (again assuming it’s a PLB topper)
A more “average” topper would be in the 19 - 24 range with 28 - 32 being firmer for those who preferred a firmer comfort layer (vs better support) or who were heavier.
So the best choice would depend most of all on your weight and on how far away from your ideal you are with your current setup when you are sleeping on your side but given your feedback I would think that 32 ILD would be on the firm side for you and if I was to use a thicker layer I would use 3" in the range of 19 - 24. One other option you have … depending on how much more thickness/softness you needed … would be to add an extra inch of say 19 - 24 ILD latex with its own cover (which is important with latex) under your current topper or using a new 3" cover you could enclose both layers in the same cover. This may be less expensive than a whole new topper.
There are some sources in post #4 here for both toppers and covers.
So it really depends though on how close your current layering is to matching your ideal. If you need “just a touch” or “just a little” more thickness/softness than what you have then the extra inch would probably be fine (either as a new 3" topper or an extra inch) but I would make it closer to the layers you already have or probably no more than 24 ILD (again depending on your weight).
Phoenix