We unfortunately can't make Formula plastic any softer than what is found in the F4/130 boots. The plastic that is in the 120 & 110 is a fantastic polyurethane (ether) material that is super damp, smooth, and progressive but not temperature stable.
The ShockStopper boot board from the Remedy will go into any Redster TX boot.
Fitting a ZipFit into a boot is possible, but it entirely depends on your foot's volume and how that interacts with the shell. I cannot fit such a liner into a CS/TX/Remedy, but many folks can.
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