Here is a pretty current thread on AudiogoN about the 103:
Cart from the 80's - cantilever suspension may be drying out causing stiffness and excess harshness. It would be the suspension not the cantilever that would be sagging. I had at least 4 103's come through my system and one is playing now. The body tends to ride close to the groves when set up right - but you may need to experiment with vta if highs are edgy. If your system changed since you've listened to the 103 , well...they tend to be extended but tizzy on the top end - wood body helps with this and potting even more. On your carbon fiber arm - the 103s maybe a better match because of the higher compliance -the 103 is very low requiring a heavy tonearm. But soundsmith , if you call and ask I'm sure will recommend what's best...