[quote name='EBS_freak' timestamp='1476354845' post='3153529']
I'm guessing theres not enough tension in your string if you are using an E string detuned to C.
Try a higher tension set of strings - maybe something like DR Low Riders, a 5 string set (45-125), but as you are detuning the whole lot, use the 65, 85, 105 and 125 and not bother with the 45.
Should you not be detuning the whole lot (I'm not sure what you are doing tuning wise - are you just dropping the E string or the whole lot?) and just the lowest string, then just replace what you have for a B string and go from there (although you can't get separate DRs off the shelf).
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I'm happy with the tension and sound of the 3 higher strings, so I'd really like to up the low string to a 120, but I'm not sure the standard nut on the P bass can handle that, may have to file the nut?
I'm also gonna try slightly adjusting the pickup height for the meanwhile.