Gil,  It looks as if nobody wants to comment.   I think your fuel combo looks pretty good.  As new as these "Ceramic"  piston/liner sets are,  we will be just feeling our way in the dark for a while.  Joe gilbert has had a considerable amount of time on his "Proto-type" one now for a couple of years.
  Mine that I got fron overseas (New Zealand I think)  has run really well on 25% castor for three years now and shows no sign of wear.

  Bigiron

I have a Fox with one of the Ausi ceramic P&L's and have always just ran PowerMaster 10-22 50/50. Not saying this is a recommendation just what I have been doing. My rational is the ceramic P&L is bullet proof which leaves the con rod and front bushing to worry about. I haven't worked my Fox hard as the two airplanes it's been on were both under 30 ounces and running smallish props, probably why I have been able to get by with 11% castor.