There are HUGE swings in the power of some uniques vs others. The Aegean thread item got majorly buffed sometime after release (I remember the thread where Nathalie brought to attention the lack of power originally). Likewise, more recently acquired Potency items ( great shield, Helen and Athena’s wings) got a major buff, while the two cooldown uniques got a 40% nerf.
You just have a crappy old unique where the new ones are better.
But more to the point, that unique REALLY sucks. I have cursed items with almost as much leadership, and I’m lower level.
regular cursed item I got when I was like level 124. Not a bugged cursed item.
brand new cursed item I got at either 127 or 126. It will be better than your unique when it’s titan quality.