I've dropped the pole pieces as low as they go but haven't touched the casing levels yet, I'll try it now!I'm not Leo, but I'll chime in anyway.
I've noticed a few of your posts regarding your experience with the Tookay.
It's unfortunate that you're not getting the tone out of it that you want.
You shouldn't have to 0-out all the controls to get one "decent" tone.
Others have mentioned strings, but no one has asked about set-up/pickup height.
As has been stated numerous times, the MFDs are pretty hot. If you have them set at a similar height as you would on a P-bass, the tone is going to be pretty wooly. Have you tried lowering the pickups at all? I've read some posts of other having a similar experience as yours, then lowering the pickups quite a bit and opening up the tone of the bass for them. If you haven't tried this yet, give it a go and see if this changes your mind on the Tookay. If you have, then the stock MFDs may not be for you, and there's nothing wrong with that.
my bad eyesight told me there was no adjusting the PU heights, I see now they can move. if this helps then I've got some re-posting to do... don't want to dis a worthy product for my own deficiencies. thanx!