See I think that is the problem right there- 3ml is too short a stroke. I'd go with a stroke length of 4.2 mm for black, or colour packing. 3mm or 2.6mm is fine for b+g work, but the needle travels faster with a stroke of 4.2mm. Think of it like this.. hold a sheet of paper up, and push a needle through it. It wont go through because the paper will bend. Now try to stab the paper with the needle- it'll go through because the paper can't react fast enough to bend. Same on soft spongy female skin, it has lots of give, and needs speed not power to puncture the skin.
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