SOLVED. Adult Science Fiction, Future Earth. A man is bred to stop an alien invasion. Spoiler. [s]

[John]

Read this book (paperback) in 1980s or early 90s. In the future, there is an alien invasion heading towards Earth. Some humans have mutated into different subspecies. To combat the incoming invasion, a breeding program is developed to create a 'super' man bred from various human sub species. The man is born/created, he has a metal plate/mesh put in his skull to limit his abilities until he leaves earth. He is sent off earth to stop the aliens.
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Spoiler Alert?
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He goes thru hyperspace (which has more than one level) and finds the alien home world. He finds out that the aliens attacking are under control of a third group and he stops them.

[SBC]

The Silkie?

[John]

Thanks for the suggestion, but I don't think that was it. I don't think the book I am looking for was from a well-known author, or I would have found it by now. That being said, The Silkie looks like an interesting read!

[John]

Found the book I was looking for from a similar search on SFFChronicles.com. The book is I, Weapon by Charles Runyon

[Kris]

Great! Glad you found your book, John. Thanks for the update.

I, Weapon by Charles W. Runyon

[SBC]

That's great, I'm glad you found it :)