If your fretless has treble that your fretted doesn’t, I would contact Lakland. Because, that sounds weird!
But, in the mean time.... see if something is weird with the MM humbucker. That’s where that Stingray brightness and attack should come from. Is the MM pickup height adjusted wrong? It can and should be a smidge closer to the strings than the J pickup. If the height is correct, check each coil by soloing the MM pup, and using the switch to try each coil individually. If all seems normal with the MM pickup, then are you using bright strings like fresh stainless? Is the mid frequency switch set to the factory setting? Is your battery fresh? That’s all I got, LOL.
Good luck!