I recently switched over to DR Hi-Beams (from GHS Boomers) on my Spector Euro 4, and ever since have been getting a strange buzzing sound from the head end of the neck on the low E only, especially when played open. Putting the slightest pressure on the string behind the nut (using my finger as a "string tree") seems to alleviate the problem. I have wound the string as usual, with as much downward angle on the last go-round as practical. I never had this happen with the Nickel Boomers, and am a bit puzzled. The tuner (a Hipshot Extender) seems to be in working order (well, actually it won't return to pitch properly at the moment), and not the source of the buzz. Now this is not a terribly bad buzz, but just mildly annoying enough to want it to go away. Any suggestions?