Re: Sustain question
You have to remember it is a cumulative effect, that's why a guitar why say a strat with two APS' and one Hot will not have as much string pull as 1 APS, and 2 Hots, or 3 hots. To put it simpler and in a math form.
A2 has string pull of 3
A5 string pull of 5
3+3+5=11
Whereas
3+5+5=13
11 is never greater than 13.
This is over simplified and assuming that all things are equal. Pup heights, same magnet style (staggered, flat, polpiece, studs, etc) Remember an A2 pup 1/16" from a string will have more pull than an A5 3/16" away. Once again, all other things being equal.
Luke