No problem at all. I mill my own grain and I have the mill set to a very fine crush. The BL false bottom works very well. I do have the flow throttled back quite a bit, but still at a good rate. I have run it through at full throttle and it did not stick. Also, I re-stir the grain every 15 minutes and then let it sit for the last 15 before starting the fly sparge.
I usually adjust my valves for 3 different levels:
Full Flow - When I'm heating strike water, it recirculates at full throttle.
Med. Flow - When mashing, I want the recirculation to keep the temperature consistent throughout the grain bed.
Low Flow - When fly sparging, I cut the flow to get my 12-14 gallons of wort in about 45 minutes.