What way is the w/g plumbed up ? And what are the gain settings, set duty etc set up like ?

All of those can impact spool.

If you have a screamer pipe and the w/g wasnt sealing properly, you'd hear it during normal driving or at idle as it would be leaking then too.

Dump valves are another aspect. I did hear somewhere that you want to retain some boost in the plumbing during lift off, so a fast responding and high flowing dump valve isnt what you want.
I'd find that hard to believe though. I'd think a fast acting and high flow valve would be what you want, to vent the air as fast as possible so the un-driven compressor doesnt have to work against it.

So no idea what's best there.