I just bought a Peavey 4 AC BXP, and I love it. The sound is perfect, the neck is comfortable - I love this bass. I play lots of metal music, so I like to have a clean, fat sound, so I strung it when Ernie Ball Power Slinky bass strings (55-75-90-110). The problem I'm having here is, from frets 1 to 6 the strings are rattling very badly, even the open the D and G strings. When playing a Bb the other day, I slightly bent the neck back just a hair, and all the strings were hugging the frets, and absolutely no notes were produced at all. I have the neck as straight as I can possibly get, but still from frets 12 to 19, the action is very noticeably high. I've done some research and I can't find anything that will help me get rid of this problem. Anything on this would be great, thanks.