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Nice, straightforward procedure. Well done. I'm partial to the Roy Underhill/Frank Klausz, pins first method, but I can really see the benefit of your tails first approach for consistency and efficiency.
I've just ordered some black soldier fly larvae (BSFL), so I'm just going on what I've learned looking into this: BSFL give off a scent that is repellent to many other flies. If you start a colony of BSFL, and there are black soldier flies living in your area, you stand a chance of establishing an ongoing run. From what I understand, you can supplement your chicken's feed and reduce the fly population using BSFL....http://blacksoldierflyblog.com/2013/02/12/black-soldier-fly-mapping-project/