With a great rig like yours, I think you really owe it to yourself to buy a modern cartridge. Without naming specific models, I'd recommend:
Transfiguration
Lyra
van den Hul
ZYX
Shelter
and if you can get the Monster rebuilt for two to three hundred dollars, great! Keep it as a spare. The Stylast solution is a little like using Armorall on old plastic, i.e. you cannot re-polymerize old dried-out rubber/plastic products. You can only temporarily "knit up" the unravelling molecular chains, but they will never give you the original performance, and will come undone again in relatively short time.
Transfiguration
Lyra
van den Hul
ZYX
Shelter
and if you can get the Monster rebuilt for two to three hundred dollars, great! Keep it as a spare. The Stylast solution is a little like using Armorall on old plastic, i.e. you cannot re-polymerize old dried-out rubber/plastic products. You can only temporarily "knit up" the unravelling molecular chains, but they will never give you the original performance, and will come undone again in relatively short time.