Alter Serial Shot skill's lock-on mechanic to be more forgiving.
Per standard, Serial Shot will trigger if you have an arrow drawn for 3.0 seconds, forcing a bodyshot regardless if you were aiming elsewhere, eg a stunning leg-shot or a lethal headshot.
More often than not, this skill ruins setting up shots if you take a moment to acquire your target.
Either alter the duration, or the lockon zone from Body to Head. (Or a method to respec your skills works too!)