@julie777 interesting informations
My side, I have used another printer to print very simple pads (like a cylinder about 20mm height and fitting in the existing feet) using FilaFlex 60A, 25% Gyroide infill, it works like a charm.
May be this will be of some interrest : I have used a modified CR10S Pro with a Bondtech DDv3 Direct Drive Extruder and a 0.6mm CHT Nozzle, it can easily print 60A Shore, it only require to fully unscreew the extruder tensioning screw and increase filament flow to 1.4