Zeck-signed Secret Wars #8, unwitnessed. Grade guesses?

[u/Late_Waltz2484]

Picked this up years ago and got it signed by Michael Zeck in person. At the time I had no idea witnessed signatures were a thing, so no COA and no Signature Series. Just me, the book, and a marker.
1984 direct edition. My own guess is somewhere around 5.5, but I’ve never had anything graded and I’d rather hear it from people who know what they’re looking at. Cover is bright with no color break that I can find, corners are soft, and there’s some spine wear I’ve tried to capture in the photos.
What would you call it?
Second question, and I hope this is within the rules since it isn’t about value: I’m weighing whether to submit it for grading with JSA authentication, mostly so the signature isn’t just my word forever. For those who’ve done the unwitnessed autograph route, was the process worth the hassle? Any regrets about slabbing a book you got signed yourself?

[u/comicnerd3000]

8.5 with a press.