I just got my first custom & @ 55%, it seems like ALLOT of density!! My stocks that I sent back to have the density dropped on, from about 65% to high 40's to 50%, were cool, but the full perimeter Walker tape attachment would sometimes be visable on the sides, if hair wasn't positioned. You can go low down the middle, but if you're going all tape, I'd stay at 55% density on the sides & back. No issues in showing Walker @ hairline, and even better since I went French to SFS.
You can also search my photos for how it looks