its Ultegra 6600 shifter and rear derailleur
I loosened the cable adjusters on the downtube by the headset and at the derailleur and readjusted everything.

What I realized is that the plastic ferrule inside the turn adjuster at the head tube binds a little with the turn adjuster
and when the handlebar is turned left or right it tends to cause the adjuster to turn a bit with the cable flex which appears to be the problem causing minor cable adjustment requirements.
The cable housing and ferrules are shimano and are in good condition.

What can I do about this ferrule which is binding with the turn adjuster ?