Thanks for the replies guys.
I changed to standard tuning and found that I couldn't get proper intonation there either. The strings are snug inside the nut slots.
I'm unsure as to what you mean by relief and action adjustments. Do you mean adjusting the nut height and adjusting the truss rod? I'm fairly new to the fine adjustments of a bass, but I do want to be able to do them myself. The action is very high on my Warwick. I use Ernie Ball Regular Slinkys. .50, .70, .85, .105.
I use a Korg Pitch Black Plus as a tuner.
Thanks again!
