As has been mentioned before, you have pure Conspirator engines vs. engines that use Conspirator as an auxiliary source of money.
Ironworks is great for pure Conspirator engines, but you need to have some great enablers at $4 or less. Light trashing, cards like Warehouse, Scheme, Caravan, etc., and no Colonies are great indicators for a pure Conspirator engine. However, with no trashing on the board and a lofty target of $11, you'll need something more powerful.
Just keep in mind that if you're really going out of your way to try and make Conspirators work, then they probably won't work.