"Occasionally"!? His interrogation of Poggle in 'Brain Invaders'? Murdering Merrik in 'Voyage of temptation'? The entire Mortis arc? The Citadel arc? The Zygerrian arc? How he handled Kenobi's "death", and was tested by Dooku in the 'Deception' arc? How he struggled when Ahsoka was taken by Trando game hunters? Hell, how just barely stopped himself for forcing he way into seeing Ahsoka in prison? Literally everything involving Clovis? Murdering Trench on Anaxes? Those are just off the top of my head. But sure, it was an "occasional" struggle.