This row - Ssk,k3, *p1,k-below,p1,k3 ; rep from * to last 2 sts, k2tog - you have decs at the beg and end of it and every 6th row after that until you get to 55 sts.
The next dec row would probably be - Ssk, k2, *p1,k-below,p1,k3 ; rep from * to last 2 sts, k2tog (only instead of ending the row p1 k3, k2tog, it'll be p1 k2, k2tog). Next time it's - ssk,k1, *p1,k-below,p1,k3 ; rep from * to last 2 sts, k2tog with the last repeat being p1, k1 k2tog. See how the sts that are repeated are still the p1 k1b, p1, k3 pattern? That's keeping the textured pattern intact, with decs on either side of it.
After you reach 55 sts, just work in the pattern for another 9" and the last row you do is a knit row. Then you do something else.