I've got the regular and taller pro Henning basepads for the 17s. When installed on a 15 round tube in a P01, Pro's have .075" gap, and standard have .140". Both of these have a lot of meat below the tube also, so maybe not the best if your talking about a carry gun or have to fit in a box.
What I did is to get the Henning 18rnd basepads and mill them down for 15rnd tubes in a P01. I had to swap out the original plastic basepad retainer for a metal version to get it to work. They don't follow the profile of the grip like you're after. But I like the low-profile feel and similarity to my Production gun.
BTW, when I placed an order for compact grips and 18rnd basepads, somebody noticed that these usually don't go together and Henning called me to confirm. Very impressed with that. I told him what I was up to and asked about P01 pads. It sounded like its on their radar, but one of those things they haven't got around to yet & there wasn't much demand.
Anyway, it was lots of monkey motion for sure, but I like the results.