[Nirvash]

We/I use a good quality crimper, it isn't ratcheting but as long as you make sure to crimp all the way it shouldn't be an issue.
Make sure to match your connector to your wire size, too large wire in a crimp or too small will cause a bad connection.
I've never had an issue with insulated terminals, in FRC or at work with equipment that runs for thousands of hours with heavy vibration.
And of course, make sure to pull test your crimps.