I know this is rather late, but just wanted to say that constant shedding could have a number of causes, and it might be useful to look into those. It could be a medical condition, or frequent stress, or an upset circadian rhythm due to bright lights at night and/or staying up too late. I stay up past midnight, but always make sure the lights are dim after 9 pm.
As for brushes, I may get in trouble for saying this, but I use a lint roller when my bunnies get really bad. BUT ONLY WITH THE FOLLOWING PRECAUTIONS:
1. I stay away from head and ears, and use it only on back and sides.
2. I always reduce stickiness of the lint roller first by rolling over my arms and t-shirt. I then test it to make sure it’s not too aggressive.
3. I go very slowly so as to get only the loose hairs and not mess with attached fur.
4. I would NOT try this with long-haired bunnies, since it’s too likely that attached hair will roll around the roller and create a huge problem. My bunnies all have short hair.
Try this at your own risk. Even if you don’t want to use it on your bunny, a lint roller is great for cleaning hair off the counter and everywhere else surrounding the bunny after you’re done brushing, including you ;-)