I've been having this same problem with my oldest boy (about 1 and half year old). This is the worst shedding he has ever been through. I tried a cheap 4 dollar cat deshedding thing from Petco and it worked some but not as good as just a normal black short comb you can get at like walmart or the dollar store. I haven't tried the fancy $30 deshedding tool yet but I've heard good things about it though, I just didn't have $30 at the time when I was in Petco a couple weeks ago.
He is almost completely done getting his winter coat now but it was so bad that a huge wad of fur came off every time I went to pet him. I used that cheap black comb on him and he seemed to like it cause he would sit still for a long time and let me use it on him. I could comb enough fur off of him in one sitting to make another bunny it has been so bad this year.