Re: Question about pickup type
Many guitar players just seem to believe that if the poles don't line up right, you will get less than optimum tone. It makes absolutely no difference IMHO.
What does make a difference, is the shape of the coil. The F spaced pickups require a longer bobbin and consequently, a wider coil.
The width of the coil can have a listenable difference in tone. The wider a coil is, the darker it will sound.
Plus, humbuckers have a fairly wide magnetic aperture that will completely encompass the differences in pole distances.
Since I mainly go for presence, brightness and attack with my tone, I shy away from F spaced pickups.
I'm pretty sure that the darker and thicker tone from SD's trembuckers compliments the slight and not so slight tone loss with using a vibrato device.
Hardtails will usually sound a bit more full and present than guitars equipped with vibrato units (some more than others).
Floyd Rose tremolos usually suffer from a sound that is a bit thin and has less sustain... the wider coil of the trembucker can slightly beef up the thinner tone that a double locked Floyd Rose system imparts.