Corrugated cardboard is your best friend when it comes to worm bins.
I don't bother to shred mine. Instead, I have a pre-soak water drum with a lid. I've added a handful of horse manure to the water, and occasionally some kelp soak water, or worm bin leachate to that. I rip up my pizza boxes or egg cartons or delivery boxes into big chunks, maybe 3 pieces for a pizza box, 4 for a bigger box, and drop those into the pre-soak overnight. That softens it up nicely, and kick starts the microbe rot and it breaks down much faster in the worm bin.
If you ever end up making your bin too hot and you see the worms slithering up the sides then a top layer of corrugated cardboard is absolutely magic at restoring balance. That can happen in mine when I add too much frass, or brewer's grain, or grass in one go. Within a day, everything chills down and no more attempted escapes.
It's also great as a top cover to cut down on fungus gnats when you add kitchen scraps. Just cover the surface loosely with the soggy soaked cardboard. If you reduce the exposed surface then the gnats can't get to lay nearly as many eggs.
Whenever I lift up a piece of cardboard, I'll find bunches of worms congregating either in the cardboard, or just underneath. Mass orgies and feeding frenzy.
If you're keeping a nice balance with the cardboard, you don't need to be nearly as fussy with your inputs. It modulates things and stops runaway nasties. Sure, I avoid too much onion, and too much citrus, but I don't pick out every piece. I add bread and potatoes and a bunch of other stuff on the forbidden list, and yes, those can mould up and grow filaments, and look pretty fuzzy and foul, but it never causes any harm, and I'm a great believer in diversity of input, diversity of rotting fungi or microbes or bacteria.
Lastly, never cover the whole bin surface with any one type of food. Add stuff to one side one feeding, and then the other side next time around. Sometimes your worms will avoid stuff like a whole green pepper in the corner, but a week later, they are all over it. So give them space to stay away from stuff that may not be immediately palatable, but they will literally eat anything once it degrades enough.