Hi Ryan,
The Snowmass actually has a 3" comfort layer (1" polyfoam in the quilting and 2" of latex) but I don’t know the ILD of the polyfoam. I do know however that it is firmer than the 3" comfort layer in the Aspen which also has an inch of polyfoam in the comfort layer but it is under the 2" of latex and is softer. This may be worth testing as well.
The Telluride has closer to 6" of foam above the innerspring for the comfort and transition layers.
1½" 1.8lb Density Convoluted Foam (likely softer)
1" Bioflex™ Soy Based Foam (unknown ILD)
2" Talalay latex (I’m guessing this is also 24 ILD)
1.25" convoluted polyfoam (again an unknown ILD)
It is called Plush so the thicker layers of foam and the combination of ILD’s probably makes this a little softer than the Snowmass but it’s difficult to know for sure where it fits because of the unknowns.
Because of your lighter weights though and also because the Winterpark only has an inch of foam above the innersprings and then just a fiber layer (which will tend to compact and firm up over time) … I would guess that a 3" 19 ILD topper may work better for you than the 22-24 which is similar to the mattresses you tested that were a little on the firm side. There are some good sources of Talalay toppers or layers in post #4 here and mattresses.net has a 3" Talatech topper (Latex International’s brand name) which is 3" of 19 ILD (which also has a good quality cover which is necessary for a latex topper).
Phoenix