I have been fruiting my pineapple naturally with fruiting fertilizer 10-30-10. I didn't have to force them with calcium carbide. However, I have a can of calcium carbide, so I still use it.
I let one sucker grow on the plant after I harvest them and cut of the rest when they are big enough. The one sucker left on the mother plant will fruit faster than the ones that I cut off and plant.
I planted some small suckers, and they didn't grow as fast as the ones left on the mother plant, so it's best to let them get big before cutting them off.