slowglowflyer,
I have not contributed to this thread but have had an Ultimate flying for a couple of seasons. I put a servo in each wing, but on top on the (bottom) wing because the field is sometimes wet. I think with two servos you would enjoy more responsiveness than one. Yes, it doesn't look as clean as one servo hidden in the fus.

I did not mod the plane other than the usual; tri stock on the firewall, landing gear reinforcement, etc. I also have an OS 70 FS in my plane and it works real nice, not way over powered, but enough to pull out of poorly executed manuvers It's a fun flyer.