Didn't have to defret my Hamer - also scored a a J4 fretless on TB.
It has EMG's - I don' think these are the factory electronics - not the BassLines like on my J5.
I have TI flats on it also.
Wish it were a 5, but I do like the thinner neck - much less chunky than on the 5.
I play the J5 with the one tone knob at midway and both pickups at same volume through a MoBass set flat driving a BagEnd 210 and an Accugroove Gordo 18 inch sub and I'd describe the tone as mellow. I do have a fairly gentle fingerstyle touch. Interesting your comment that it just snarls.
Take care.
RJM