Keep going. The beginning of the round is where your tail is, so that can guide you there, but 20 rows before decreasing can be considered more of a suggestion--it's the total length that really matters in this case, not the number of rows.
"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