Because I'm not a "serious" gamer

I set the monster frequency at normal and have discovered that whatever normal is--ain't me.

Because if this is "normal" then I'd hate to see the next level

. I've made it as far as Xen (with Barretta in tow), but I have a feeling I missed a lot along the way simply because I was so busy fighting monsters I was too frustrated to explore very far, which is a shame because the scenery is terrific.
Is there a way to reset the frequency of attacks to "easy" in mid game or do I have to restart? I loved Laxius Force and am excited about Three Stars, but this reminds me of the ghost's mind and how I paid that guy some money to slow down the frequency of the attacks and it didn't seem to work.
Many thanks.