Maidened my Seagull Jungmeister yesterday. I was a beautiful day with only about 5mph winds at a very slight crosswind. My plane has a Saito 125 with a 16-6 APC which gets me around 8900 rpm at a slightly rich setting as it is just back from the factory with new bearings and freshened up. Plenty of power. Anyway - taxied around to get the feel and she taxis very nice, and pleasant. OK - no more time to wait, liner her up and gave her the onions and she tracked straight until the tail came up. FULL right rudder and she still swung left, but got her off ok. Climbout was not dramatic - until I tried to turn. BAD adverse yaw. Tail dropped inside of the turn and she just mushed. Fed in some rudder and the nose immediately dropped and this was true the entire flight. I fought her hard - turn using coordinated rudder but needed lots of up elevator to keep the nose tracking without dropping. All the controls were set up per instructions. She still feels tail heavy - and I have a 1lb ingot of lead in the nose ! The CG at 180mm is too far aft in my opinion - and I will be adding another few ounces until I get it around 160mm and try it there. I hate adding ballast - but necessary! I will also be adding in the differential on ailerons - the adverse yaw is horrendous. I 'thought' I was ready for the maiden after reading numerous 'experienced' flyers for this plane, most all of them said 180mm worked OK. Not feeling it - I will move it forward, increase the control throws a bit for safety and add in the differential. Oh - maybe someone can chime in here on this bit - after completing a turn and getting wings level, nose wants to climb. Push the nose back down, OK for a moment, then nose wants to drop. ????? She fought me the whole flight. Still maybe a CG issue?? The landing was OK - got her lined up and slowly brought the throttle back, and she settled in nicely, albeit a little hot - expected on first flight. But all the same, she goes home in the same condition as she got to field - always a good thing. CG - 180mm seems too far aft, and my flight seems to prove that? Differential - required to manage adverse yaw? Those are the two things I THINK are the problem here. My blood pressure is finally back where it needs to be after it landed.