A quick question on hop socks. Imagine two identical recipes being brewed with only one difference in the process. Batch A uses a hop sock during the boil, whilst the hops are thrown into batch B "freestyle". Would identical hops result in different IBU levels simply because of the hop sock? I ask because of a perceived stronger bitterness (where recipes had the same or similar IBU) from batches where I've thrown the hops straight into the kettle without a sock.