1600/cm² is probably more than anyone has done. I doubt that any of the Chinese pens actually operate at close to the rated specs, so if you're using those it's going to be hard to target within a specific range of 1400-1800/cm². The needles on the Derminator 2 needles are the finest at 34.5 gauge. The closest is the A7 at 34 gauge. I recommend sticking with one of those two. With the Derminator you will just have to move it slower, 2 passes at .75cm per second, to get the right density. It's not going to be easy to move that slow, and it's going to take more than 15 minutes to complete both passes if you're balding in a NW7 pattern.
This is a 100hz pen vs the 25hz Derminator 2:
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I still believe that the best method may be dense/deep wounding every 2 weeks in conjunction with light .25mm wounding every day or two for increased absorption of topicals and release of growth factors.
Everyone please keep in mind that they have run trials since submitting these patents. Latanaprost can be bought under the brand name Xalatan for eyelash growth, but it's very expensive to buy enough to cover your entire scalp. It's basically the same thing as bimatoprost which is cheaper, but also very expensive.