Hmm... Good luck. I would certainly want to add rice hulls to that grain bill for piece of mind, but you may still be able to get through it without a stuck sparge. What's your mash tun setup and are you using a false bottom, braided stainless, etc? Some setups will be more prone to a stuck sparge than others.
Second, what's the crush of the grain like? If it's really fine and you see a lot of powder in the bag, you're going to have more trouble than if the crush consists of consistently larger particles.
Finally, the speed in which you're draining out the wort will play a role as well. The slower you can keep the flow, the less likely you'll get stuck.