Any recommendations for nickel roundwounds on a 6 string? GHS Boomers came on it, and I could never get the volume anywhere near even between the low strings and the high strings, no matter how I adjusted the pickups. I have TI Flats on it now, and they are much better. TI strings have always seemed to be better balanced between strings than other brands. I'm wanting to switch to nickel RW, any suggestions?