1. curve/taper ... pots/knobs Volume wise mine go like: nothing, a little, a little, a little, a little, EVERYTHING. The last 10-20% of the knob sweep is more or less like ON position.
2. RF/EMI ... pickups ... pick up.
The stock pots in my Kestral behave the same. I thought that perhaps they have very high resistance values in order to assure they don't "load" the output, especially when there is no pickup selector. At the least those two pot values are always in parallel across the output. But the taper is nearly unusable, in my opinion. Can't tell what the ideal solution is yet.
Don't feel too bad about the noise on a Kingfisher, it's probably worse on the Kestrel. There are plenty of "noiseless" stacked pickups in the Jazz Bass form factor for the Kestrel though; none of them have treble as good as a old-fashioned primitive single coil though, unless there's an active mixer of the string coil and the bucking coil on-board; a stacked just has inductance and treble loss issues. And then there are also pickups that mount like a Jazz Bass pickup but inside are actually two 2-string pickups. Not two blades or some kind of "U" bumbucker magnetic structure, but they work just like the Precision split staggered pickup, one 2-string pickup has different magnetic and coil polarity, so that each sounds pretty much like a single-coil, yet each 2-string pickup cancels hum with the other. I just got a set of Nordstrand Jazz Bass pickups and hope they live up to the technology's potential.