Right now, after Update 35, most archguns that received additional Punch Through are incredibly broken and are hitting an invisible hitbox in the air, extending far beyond Profit Taker's model. A lot of the time, what this means is that Volt shield's damage bonuses do not apply, due to the bullets technically not going through the shield, due to hitting a hitbox extending beyond the shield.
Beyond damage bonuses not applying from Volt shield, the damage numbers are incredibly in-your-face, obscuring your vision, especially on something like the normal Corvas and being very confusing to look at, not knowing which leg you might've hit with your shots.
As for the Velocitus, it came out of Update 35 having 2 bugs, Delayed Damage/Slow Projectile Speed and Charged Shot not damaging Profit Taker at all. The latter of which has been fixed. During my own runs of Profit Taker, the further the projectile travels, the higher the delay between the visual shot landing and damage happening.