I'm finding that even with a good shadow defense armor set that the devilish hordes are significantly harder than any other mob of similar level, mainly because it's just so hard to dodge a majority of their attacks, I could be moving perpendicular to it before it pulls out a projectile, and it can still hit me from half a dozen tiles away. Or, pulling up my shield the instant I see the projectile, lag still lets the attack through.
Slowing down the projectile to a speed similar to other ranged attacks would significantly balance the difficulty.
No