Did you think the D warhammer drop rate was good?
1/5k is crazy and if your rng is bad can take you ages to get. And its not like Shammans are a particularly fun enemy to fight.
It might have been better to leave it at 1/5k off task and then 1/1k on task. But I think this works as well.
And this is coming from someone who got spooned one at 250kc. 1/5k is way too high imo
Shortcut changes are great. No longer getting stuck forever in the pipe on the way to hydra lol