Question #1: Flew my Funtana 90 powered by a new YS1.10 for the first time this Saturday. I am flying at 4700 ft. I had the engine running great on top end, idle (2200) and transition. However, after running in the midrange for any amount of time, the engine would sputter and die when I would open the throttle. One thing I noticed was that the engine would leak fuel out of the carb when it wasn't running until I relieved the pressure in the tank. The engine is mounted horizontally. I'm running an APC 16X6 prop and 20/20 fuel.

Question #2: What is the correct idle speed for tuning and running? Mark Fuess (see link below) suggests that the idle speed must be 2000 RPM or below to correctly adjust the idle. He states that the reason for this is that 2000 RPM ensures transition from fuel injection to carburetion has taken place. Any comments?
http://home.comcast.net/~mark.fuess/ys110.htm

Question #3: How is the bottom end of a YS1.10 lubricated? I've read that fuel is injected only into the air chamber. My understanding is that other nitro 4-strokes depend on blow-by to lubricate the bottom end. With the YS, the crankcase is typically under pressure so I would expect this to reduce the amount of blow-by.