I hear you...I too am just left to conclude it must be wear. It drives fine and nearly all is replaced but there's just those few things left I can do before I retire my efforts on this.
Yes it is good...and I thought perhaps mine was jumping -5 to 4 because it was a cold start. Perhaps I was just wishing another issue away when I saw it, LOL. I should look at LTFT-idle again when it is warmed and I have returned from a drive.