I have just checked the Dan Erlewine book and you are all right, the truss rod should be adjusted with the strings strung to pitch and the guitar in the playing position...my bad !!!!

I was getting confused with hearing a "squeaking noise" which means the rod is over tightened which is a bad thing as it can strip the thread !!!

One day I will remember where I put my head and with any luck that will let me get my foot out of my mouth !