If it says to decrease at the end of every other row, that's what you should do. If you decrease at the end of each row, you will get to your desired number of stitches before you get the length you need and the angle of the decreases will be too great.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry