Yes, you're right, this is the way the increases go.
row 2 has 2xkfb and 2xm1 (+4) = 35 total
row 4 has 2xkfb and 2xm1 (+4) = 39 total
row 6 has 2xkfb and 4xm1 (+6) = 45 total
row 8 has 2xkfb and 4xm1 (+6) = 51 total
See if the video linked to above is a help with the kfb. You start with one stitch on the left needle, knit into the front of that stitch and then swing the right needle around to knit into the back of the stitch, then drop the stitch off the left needle. You now have 2sts on the right needle. A kfb isn't 2sts, a kfb turns one stitch into 2sts which is an increase of one stitch over the previous number.