I also have an SD retic. Bear in mind that a good shed starts while the new skin is being formed, well before the prior shed cycle has completed.
Most retics don't have "good" one-piece sheds because they're very enthusiastic about the process and their skin is fairly thin for their size. So, when they shed it looks like a skin explosion all over the enclosure. As long as your snake is shedding completely with clean eyes and tail tip it is ok. If it's not then bump up the humidity and I'd suggest keeping the snake better hydrated by offering its feeders wet. I will note that bunny fur can hold a lot of water, though this does also mean you get a flooded enclosure 2-3 days after feeding.