Hey there mate - I had an almost identical problem when I got hold of a set of DR Black Beauties, in fact (my mistake really) I tried to pu ton the Black Beauties only a few hours before a gig and the G just wasn't staying on the peg...

I think the coating is actually a bit fo a disadvantage when trying to put the strings on as it as it made the strings slip off the peg. For this reason, I think they would really benefit with a silk wrap at the end! The G string also sounded absolutely horrendous after the 1 hour ordeal of putting it on, unfortunately probably the last time I ever use the Black Beauties
