Very interesting, to say the least.
What do you attribute the positive effect of the longer needles? I would think that it is getting the delivery system into the "meat" of the matter.
I am currently using the BD Ultra-Fine™ Mini pen needle at 31 gauge, 5 mm (3/16") with no pinch and they seem to be working for me. I am glad that the longer needles are working for you.
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Regards;
Danny 
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