I'm not sure where the problem is. I didn't think that the inching valve was a cause as well but it is. When you engage the inching pedal in the slightest, the truck will hesitate before picking up a direction. Its almost like the pump loses it's prime anytime the transmission is in neutral or once the inching pedal has been used.
I have been told that a 2 second delay is normal on this truck but it doesn't seem right to me.