I put 3 layers of O rings on the stabilizer housings. This made the stabilizers get the lower-pitched and lower-level sound, but it didn't make the spacebar key mushy/sticky. If you like to hear low-pitched sound from your stabilizers, you can try it.
Keyboard: DROP CTRL V2 + foam kit installed
Switches: TTC silent frozen V2 (factory lubed)
Keycaps: LTC KDA profile, dye-sub keycaps (no longer available on Amazon)
Stabilizers: DROP phantom stabilizers (holy mod, a light dielectric grease applied on the metal wires/bars, dampening pads installed on the PCB)
O ring size: 8 mm (OD) x 5 mm (ID) x 1.5 mm (CS)
Recorded using galaxy note 10 plus connected to TASCAM DR-40X