If you need to attach the 14 gauge leads to the jags directly I recommend getting blue rings with a smaller #6 instead of a #8 hole. When picking crimp terminals always try to use the proper hole size for the screw to eliminate the posibility of the lug moving under the screw, and so there is max electrical contact.
Always avoid using such a large holed lug you need a washer too
It really isn't that hard to make a good crimp on an quality insulated crimp term, if your team is using those cheap stamped steel auto store multi tool crimpers consider getting a crimper like a Klein 1005 or a T&B WT112M. Stay away from cheap hardware and auto store crimps with vinyl insulation as they often are very thin in the rinf, fork, and in the barrel too and often do not have brazed seams in the barrel either.
In my work we reserve uninsulated terminals mostly for equipment grounding and high temperature terminatains in heaters and the like.