Hi, I've got super light gauge steel strings on now, and I like them, but I want to try heavier strings. If I go for the same strings in heavy gauge, so instead of .40 .60 .80 .100, I got .55 .75 .90 .110 would they fit the bass or would the nut need to be filed? I'm not having the bass modified at all to try out a new set of strings... Also, what determines the gauge? Are some gauges suited to particular styles of playing/music or skill level? Thanks.