What is a good brand/type of string to use for slapping? My main problem is that when I slap the d and g strings I hardly get any sound out. Should I get a heaver gauge or are other brands better for this? Thanks. p.s. Right now I have medium ghs boomers. I loved the sound of them when i first put them on but they lost it in about 2 weeks. Is there a brand that has the same type of sound but lasts longer?