Cant help with a manual or c/g but mine has about 2lbs of lead in the cowl under the engine with a retracting tailwheel. I used a lightweight and cheap plastic main gear unit for a small 15 size model and it works fine.
Controls are very sensitive in general with ailerons and elevators especially being sensitive. I dont have numbers but i probably have only 5mm elevator movement for flying and a tiny bit more for landing. Ailerons probably 10mm at full deflection? cant remember but its not much. Rudder i have plenty of and flaps at least 45 degrees. You need an elevator flap mix in it as the gear/flaps drag the nose down once deployed, which is normal.
In general its a great model but it take no prisoners at the stall so dont attempt long/flat landing approaches or it will not end well.