Hey Jared,
As far as I know there is no "confirmed" dominant version of the Arabesque mutation. I believe the more reduced patterns seen in Arabesque to Arabesque breedings to be more a form of line breeding than an actual "super" form. It would be interesting to see photos comparing say F2 with any F3 offspring to see if they are cleaner with more reduced patterns.
cheers, John
-----
www.johnberryreptiles.com
www.designermorphs.com - the most complete guide to boa & python mutations, morphs and hybrids