I know I'm repeating things, but there is no excuse for a bad crimper. Wiring problems can cost matches(not cheap at all). In previous years our wiring was atrocious and we got a LOT better this year. I believe we got this
crimper but a cheaper one should be fine.
One thing that I didn't see other people mention is wire strippers. I'm not sure which one of these we got, but either should be good depending on what features you want and how much you want to pay:
www.mcmaster.com/7221K61
www.mcmaster.com/7221K24
It really helps speed up electrical and helps get more consistency. Honestly for the price of electrical failures(assuming 16 matches if you make it to finals, that $300 a match) I'm not willing to skimp on electrical equipment.
We also have our crimps in an organized box and wire on labeled rolls. I make sure students know what size wire they are using for what(drive is usually a bit bigger than everything else, we use larger wire if we have extra weight that year). Our crimper has the size of wire/crimp slots labeled and the crimps fit snugly into their slots. This has prevented most of the issues we have had in previous years.