Help: BFR Fretbuzz Issues

Hi, I purchased a mint BFR DD3 Stingray Special recently and am somewhat disappointed with the frets thus far. I have brought it to a couple of techs after trying my best to adjust it to specs but I cannot get the bass to reasonably setup without all of the frets buzzing on the E string. When I get the truss rod setup nicely, the A, D, & G strings are great with the action setup to EBMM specs but the E string buzzes on all of the frets. I’ve had to raise the action a few 360 degree turns to about 3.5mm on the E string (and all the others to try to balance the volume between strings). What is the best course of action for this situation? I like the way the bass sounds but it would be nice if I could have it setup like my other stingrays which have much lower action. Do I need to have the frets fixed? I’m assuming the frets are screwed up towards the E string, or maybe the neck twisted or something. Any help is greatly appreciated!