I'm not used to using the single position crimp tools, so I made a rookie mistake. I was using the correct size jaw to crimp the wire section, but then incorrectly using the next size up to crimp the insulation. In reality I should have been using the same size jaw for both. After I'd made the video I applied several of each crimp with the basic iWiss tool using the same (1.6mm) jaw and it did a perfect job of them all.
It appears that the Dupont style connector termination tools actually curve the insulation grip around it, but don't bite into it. There's a very thorough guide to crimps and tools here:-
A search on eBay shows that Iwiss seem to do mainly crimping tools. If you search for the keyword Iwiss and lowest price first you'll find the IWS-2820 (28-20AWG) in the results.
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