Ideally I'd run the mounting arm parallel with the chain stay and have the tensioner arm around 110-120degreees, like any trials rider would...but the first jockey wheel sits too close to the 18tooth cog.
I find with a slightly slacker than normal chain, there's less tension on the system and the cranks spin more freely because of this - making it easier for crank flips.
May still go full retar...trials rider and run 22:16.