It’s not terrible. It’s right on par with everything else.
My guild mate and I have been farming the vets since double drops. We both started Vet Han at 15/30. Double drops clearly helped, but afterwards, we started doing 700 crystals per day (saved up from both arenas) 744 cantina energy (3, 100; 2, 200...no need to go to 400 as it’s counter productive at that point). We’ve been comparing farm stats, and give or take a couple of shards between us, it’s been pretty consistent (or, consistently inconsistent ... what ever you prefer)
We’ve averaged about 15 shards per day. I’m 33 shards from 7* vet han. It’s really not that bad.
Chewy on the other hand, is 15/30 and will take probably about two weeks if we follow the same formula. We’re hoping for another, 11th hour double drop prior to the Rey event.
I’m not sure if it’s following the 33% drop rate, but over all it’s not bad. As with anything else in this game, there’s always going to be progression/regression to the mean.