I just bought my first Gretsch and the headstock slides south when I wear a strap. I'm using a strap that's rough on the backside - it's not a slippery strap. I'm guessing the solution is to install a strap pin in a different location. where do you suggest I put it? or do you have another solution? here's a photo with two possible locations that I can think of. I'm not sure which would be best. thanks.