Unfortunately no, I auto-attack using the press once and forget method (left click; mouse mode). Otherwise it won’t be an [auto] attack in my eyes anymore.
The attack speed definitely improves at 100 DEX (base + invested). I just didn’t want to have to upkeep Monstrance to make it even more efficient.
I also noticed that once a boss fight begins (after its invulnerability timer wears off ofc), I will immediately cast MM on it then 2x Heal, Cure, Breaking Wheel, 3x God Smash and then and only then will I start AA-ing. Different bosses may require me to cast a Safety Zone or Counter Spell in between to avoid getting interrupted.
Normally it’s dead once my Breaking Wheel expires… if not near death already.
*Counter Spell is especially helpful versus the boss fight against Tomb Lord, it prevents anyone from getting KD’d by his magic balls of extremely long knockdown and annoyance.