hmm, i thought you were implying that i was using pliers to crimp them, instead of actual crimpers. (which would've made you a jerk, which is why i didn't elaborate much further.)
instead it looks like you call them "crimping pliers" instead of "crimpers" (or perhaps "crimping tool") like most american english speakers. fair enough.
looking very quickly at some youtube videos, i appear to have something similar to the cheap ratcheting chinese crimpers, not the (apparently) popular and non-ratcheting japanese crimpers.
i'll pick up the different tool and see how it goes. ...i've still got hundreds yet to go, so it'll have plenty of time to pay for itself.
You have to be careful not to damage the square part when crimping. Some have a little tab that give a guide how far you can push it in to the tool without damaging it.