To work the decreases evenly, use the following method:
*(K3tog, repeated 14 times), K2tog* repeat the pattern between asterisks 5 times
You will do a total of 70 K3tog decreases, which will decrease 210 stitches to 70. You will do a total of 5 K2tog decreases, which will decrease 10 stitches to 5. You will end up decreasing the 220 stitches to 75 stitches.