I've recently bought a Squier Jazzbass V, which I've tuned up to drop C (C-G-C-F-A). I'm using the .130 on the low C string, which should be overkill for a C. However I'm actually finding I haven't got enough tension. If I tune that string up to a D for D standard, the string feels and sounds great. Is there something maybe wrong with the set up? Surely I shouldn't need an even thicker string, but it feels like that's what I need. If it helps, the gauges for all the strings are .130, .085, .065, .050, .040 . All the other strings are fine.