I would be quite interested in you Crab builds :-)
Eh, there's not much to it. Lots of 1-bidding after the first round, then all the usual suspects. 1 go the full 3 assassinate 3 wotc. I run 3 spreading the darkness as well and 3 kuni yori. As I'm running six 5-costers in the dynasty deck, Charge is the restricted card of choice. Alliance cards are spyglass, iuchi wayfinder, gaijin customs.
Main problem opponent is Crane/dragon, who can Let Go the Spyglasses and event cancel the events. You'd think Scorpion would be equally problematic, but just doesn't seem to work out that way for some reason. I think it's possibly because Scorpion pulls both honour totals downwards, which then enhances Watch Commander and Guardian Kami.
Surprising numbers of games are won with Guardian Kami triggering Air ring on defence.
General tip of the day: if you're on 1 honor, and opponent has Keeper role and 2+ fate, don't attack on air.