Welcome to Permies Keith, good job on the mushrooms. Looking good!
I've started a patch of wine caps this year. I'd cut the bits off that were damaged wash them well and cook what's untouched for now..
Slug control is done by nature in my garden, i see less and less of them. I build a
pond, frogs patrol the
land at night. There are brush piles for reptiles to hide and hedgehogs. But that takes time to create.
I have been patrolling early mornings and when the sun sets, just snip them in two. People use biological
pallets that the slugs eat and die. If you use chemical ones which most people do, it builds up in the predators eating the snails, killing them or reducing fertility, causing a spike in snails in the long run.
There are a lot of topics about slugs on Permies, it's a common problem.