You are saying dealer is wrong, tech is wrong, did you contact Adrian? Did he refuse to check the bass and set it up properly? I don't see him saying no to this.
If the tune is really wrong, it can't be because the bridge is 1/4 inch too close to the neck (as another user reported). This is a non-sense.
The only way is that you (or another user) are seriously out of tune are cheap strings, cheap tuner or more seriously:
- a fret ain't straight
- a fret spacing is wrong (in that case ALL strings are out of tune)
- the bridge is so miss-positioned that you can't pull the saddle back or up (not enough room) in the correct position (which, IMHO, is hardly possible when you use a professional vertical driller designed to fit a bass body...)
If a fret ain't straight you'll see it right away and for sure Adrian M would fix this.
As gln155 said, if you have enough room at the bridge ... it's basic physics and it should be in tune.
I am really curious about this issue, maybe we should open another thread.
Video and sound/records would have been very very helpful
Do you mind sharing the dealer's name ?