Hi, Adam - I have a number of Enya 19s  and once properly run in, they are great engines.
They do require quite a bit of run-in time.

WAY more powerful than a Fox 15.
As far as fuel, I run mine on 10% nitro, 22 or 23% oil, 50/50 castor/synthetic.
I've tried a number of different props. 8-6, 9-4, 9-6 and even a 10-4.
You really have to experiment to find out which prop size and brand works best for your aircraft.

I may have a manual - if so, I can scan it and e-mail it to you.

Bob Z.

There's a test of the 19-V and several tests of the BB version at http://sceptreflight.com/Model%20Engine%20Tests/Index.html