Yes they will jam up. I am sure there is a recommended flow rate for lbs per minute you are running. The manufacturer can tell you. Otherwise you are going to have to tune it in the old fashioned way. I recommend a gate valve below your hydrator as well. Long and short of it is if the grain flow rate is higher than the water can wash grain out, it will clog and put a big wrench in the works of your system. I would not be surprised if the dough did not build up and burn out your berring. You should be able to look in the mash tun and watch to make sure wet grist is continually flowing out of the hydrator. I would keep a very close eye on it for the first few dough ins. If it stops prior to you being all in you know you have a clog and need to stop the auger asap. Clean out start over. Good luck.