Compacted snow vs Level Dry Snow performance numbers
Flying a 737-800 the other day we sent an ACARS performance request for takeoff using Level 1 Dry Snow. The thrust required came back as TO with Flaps 10. After deicing we received an updated RSC that now said the runway was now Compacted snow, a more restrictive condition as listed in our FOM. We re-sent the numbers and received back TO-2, Flaps 1. As it didn't seem right to depart with less thrust and Flaps than we had before with what was technically a worse runway condition I reverted back to what we had before.
Any idea why Conpacted Snow would require less thrust and flaps than the Dry Snow? Is it due to better acceleration on the hard picked surface vs the drag of the dry snow? Incidentally we had a higher MRTW with the CS and the limit changed from obstacle to Climb. This leads me to think the acceleration somehow benefits third stage climb, but I am missing a piece here. Can someone explain more clearly?
Thanks!