RE: What I don't like about the Apprentice 15E
I've flown a couple of smaller electric powered foam trainers in the wind, and they definitely can be a hand full due to their light weight. It wouldn't come as any surprise that at 10 mph the Apprentice 15E, at 35 ounces with a 58 inch wing, will start to be bounced around due to its light wing loading. But using proper cross wind techniques should help with this (ie. cross controlling with rudder/aileron).
Sounds like you need something like the F-27Q Stryker. I've found mine is a real hoot in the wind yet rock solid!. Using triple rates the controls area set low enough that it flies more like a Kaos than anything. I'm flying more at the football field across the street with my Stryker than I'm spending at the flying field. Not sure the acreage, but there's a nice farm field adjacent to the football field that I overfly to make sure I have room - the Stryker is not what would be classified as parkflyer.
Hogflyer