No experience with the JICO replacement stylus, but I ditched the original IV and bought up a half dozen of the III's that I used before (both were still available in the late 70's).
Found the IV boring/lethargic sounding VS the III.
This said, I was using "old" phono preamps (Advent 300 phono section and the phono sections from various Dynaco PAS preamps, so perhaps it was a synergy/loading problem, though I doubt it.
Tried another highly touted budget Shure maybe 15 years ago (model #97 something) and it had the same lethargic type of sound.
DeKay
Found the IV boring/lethargic sounding VS the III.
This said, I was using "old" phono preamps (Advent 300 phono section and the phono sections from various Dynaco PAS preamps, so perhaps it was a synergy/loading problem, though I doubt it.
Tried another highly touted budget Shure maybe 15 years ago (model #97 something) and it had the same lethargic type of sound.
DeKay