So there's the "I write like" site (http://iwl.me/) I've done it before, and it's told me Author Clarke. I decided to try it agian.
"A New Threat" still gives Arthur Clarke.
"Wings of Truth" gives Issac Asmoiv
"An Unwanted Apprentice" gives J.K Rowling. (Personally, I think this is because the site has never heard of Piers Xanthony....)