Here is where I have changed things.
Next row - *K2, P1, P2tog, k4, P2tog, P1* rep to end of row - 100sts.
Make sure to align your first 2 knit stitches with the first cable. A good guide is to check the placement of the large K4 stitch cable and count back to be sure:-)
Then follow the chart below:
Bind off normally.
If you feel it is a bit loose still then tighten up the bind off - works a treat.