Needle valve setting

I have had the NADS setup for a while, but I suspect the spool up rate is too fierce. It has been set and forget since install.
So a question: Do I close or open the needle valve to slow down spool up rate?
I know, I know I could just change it and see what happens, but I really want to make small changes, as the truck goes quite well like it is--just gets to 15 or 16 psi really quickly.
Dawes set at 17 psi.
Thanks

To slow down the spool up you need to open the needle valve up.