Miser has probably the worst evasion of any end game mob so that's not really a good marked of where your accuracy should be. A safe-side bet is shooting to be right around 420. 401 will get you by on most things monks are called for though I suppose. You would likely need a belt swap, accuracy food, and possibly an accuracy ring swap for garuda as well. I run 416 before songs on her w/food as war tank and still miss here and there, more notably skull sunder, but that's neither nor there for monk anyway.