Excluding the obvious ones, which curse techniques would you consider to be top tier?

Personally, I like the less OP curse techniques more than the broken ones like Ten Shadows or Limitless.

CTs like Deadly Sentencing, Anti Gravity System, Curse Spirit Manipulation etc are extremely useful and not over powered at first glance.

Deadly Sentencing for example can strip away any Curse Tool, CT, or even Curse Energy from the victim. And since it’s rigged in the user’s favor there is almost no counter to it.

Anti Gravity System can pin multiple people down and I think its power wasn’t explored enough. Given enough creativity, AGS could be used like Pain’s Shinra Tensei and Bansho Tenin-where you can repel or attract multiple targets at once.

Curse Spirit Manipulation can be just as powerful as the top tiers given enough time and resources. The hard part is being strong enough to subjugate the curse spirits you want to use. The potential of having an army of special grade curse spirits with their own special abilities and domains cannot be overstated.