shake it up - you want the spawn bed you are going to case as flat as possible. It will mend just fine either way - most cases you wait only a day or so before you case anyway, all you need to see is that the kerenels are again fully covered in mycelium.
You may have misunderstood.
Think of a 4:1, spawn to sub. Multilayered. The sub layers have a 1:1 mix. The spawn layers are just spawn. I can have a 1:1 sub layer on the top, or pure sub if desired, and even it out as needed. In the PURE spawn layers, would it be better for the spawn to be both forked and shaken for an approximate even layer, with sub (1:1) in and out from the next layer occasionally, or is it better for it to be the pure spawn layer to be shaken and "even", or would it not matter.
My preference is to allow for the forked chunks simply because when I do a final shake, sometime those fuckers are NOT breaking up and I have to fork it anyway, and then I'm looking to rationalize my lack of shaking.
And no, I do not have a tire.