No joke.. I'm getting about 25% more SP for using just +1 materials alone over +0.

Crimson Crayfish+0 ~ 392SP (result 6 wind shards)
Crimson Crayfish+0 ~ 400SP (result 6 wind shards)
Crimson Crayfish+0 ~ 398SP (result 6 wind shards)

Crimson Crayfish+1 ~ 528SP (result 6 wind shards)
Crimson Crayfish+1 ~ 495SP (result 6 wind shards)
Crimson Crayfish+1 ~ 478SP (result 6 wind shards)

Done using Alchemy 37. No support, no abilities, just plain standard synthesis.