So ordering by Steep time is not enough - IMO the ordering should be by temperature... Here is what I mean.
I just brewed an IPA and (using my electric system and plate chiller) I did the following:
1. Chilled from Boil to 190 F - I added 2 oz Citra and 2 oz Mosaic for 20 minutes - recirculated with heat to maintain 190
2. Chilled from 190 F to 165 F - added 1 oz Citra, 1 oz Mosaic for 30 minutes at the 20 minute steep mark - recirculated with heat to maintain 165
3. Chilled from 165 F to 155 F - added 1 oz Citra, 1 oz Mosaic for 30 minutes at the 50 minute steep mark - recirculated with heat to maintain 155
The finished the Chill and into the fermenter...
Beersmith ordered the hops by time of insertion and not by temperature step down.