I rarely slap, so it's not much of a concern for me. That being said, I prefer the location of the neck pick-up being flush up against the truss rod cover, as it is on my '85 spoiler. My '99 spoiler, which was custom built, gave me a shock when I opened the case & saw it the first time. The neck pick-up was moved further back towards the bridge. I wish I had known they were going to do that. Keep in mind, this was before we had the Alembic Club & an FTC section. I didn't like the new pick up placement from a feel, tone or aesthetic standpoint.
In addition, the neck profile on the 2 spoilers were different. The 85 has a little thicker & has been the picture of stability - I've NEVER had to tweak it. The 99 - which had purpleheart laminates - was thinner, and although the purpleheart is supposed to provide more rigidity to the neck, I had to tweak it repeatedly.
Next time I order a custom, I'll have every nuance accounted for.