Re: Would a SD Distortion neck...
interesting question!
you're probably aware that the full shred shares the same wind and mag as a custom 5, but has 12 slightly shorter hex screws; to my ears this makes it sound much brighter and articulate than all the customs and also brings out the attack, but i found it a little bland...
the DDn's wind is about 12K of 43AWG and the customs are 14K of 43AWG; the DDn's wind sounds more similar to that of the JB with a more vocal-sounding upper-midrange while not having the potentially boomy low-end or shrill highs, while also sharing the customs' characteristic of having a focused low-mid push and generally being a bit of a rock lobster.
the stock double-thick ceramic mag is a bit much (even in the bridge) for my taste, but could really work for you; an A5, regular ceramic or A8 would also provide beefy full shred up the proverbial yin-yang.