I use D10. Not sure they make that anymore, but I still have enough for my needs at the moment. I do a 10 strand string with no creeping issues on mid to upper 50 pound bows. Loops are padded to 20. Padding them out beyond 16 seems quieter, and makes for a more comfortable shooting experience to me, though this may seem unnecessary to others. An 8 strand string will creep on me a bit, so I started making them with 10 strands where I found it's not going to go anywhere once shot in. I like the halo serving, and double under the bow square for the nock to fit just right, which I'm picky about.
Best regards, Chase