I've built a Simple Cub (kit) and have all the electronics installed. Using the Power Pack B setup. Using velcro type fasteners for holding the battery in place. Battery is 3S 3000mAh lipo. I've attempted flight 3 times with no success. I've had it balanced with just a touch of nose heavy as per the build video. My launches have been by hand vs ROG. Each time it has gone up into a stall as if it were extremely tail heavy, then nose over left. Not much damage, except the last time I broke the prop. Still have 2 more from the power pack set. I've been launching with about 75% of throttle. Not sure if I've built something wrong or what. Thinking all of my flying is going to have to be ARF's, which makes me sad. Suggestions/recommendations? Going to go fly my Apprentice S tomorrow just to fly something.