I have similar problems with my JR Flightstreak. I got back into control line this summer. I had not flown one since I was in junior high 30 years ago (been flying RC since then). This summer I finished up a Sig Chipmunk that I have had for years and took it to our RC field. It is powered with a HP40 flying on 70 ft .015 lines. It flys great. I could not believe how well it flies. I do not remember any of my other control line planes flying that well. Most of my previous control line stuff was small 049, but I did have a couple of 35 ships. Since I was having a ball with my new ukie I figured I should build something some of my RC buddies could try their hand at. I had a Flight Streak Jr so I stripped and recovered it. I tried it on 42' .008 lines. It flew very fast and was very twitchy around center. Also very nose heavy. I moved the cg back and reduced elevator travel. It flys better but still not great. It will loop but it shudders all the way around. Seems like it is constantly stalling and recovering. It is still sensitive to elevator and seems to fly heavy. It flys on power instead of the wing like the Chipmunk does. I let another control line pilot fly it (he is a lot better at UC than me) to see what he thought. He tried a couple of wing overs and then just flew level until it ran out of fuel. He did not like the way it flew either. Said he was afraid to loop it. I know it is built straight. I think it is just too heavy to fly very well. It definately is not a good trainer but I do have a couple of RC pilots building some ukie ships now.

David