Great Planes Piper J-3 Cub 60 - Scary Maiden

So i have been working on this baby for a while. But still some adjustment. She seem to be a bit nose heavy but very hard to land. she wanna float all the way. the manual say the CG is 4 1/2 and im starting to wonder if i did measure wrong. anyone knows how much it will be in cm? Anyhow the maiden is done and the plane is still flying. going to tune the motor a bit. it sounded a bit lean and didn't use much fuel.
Piper J-3 Cub 60
Stock Number: GPMA0162
Wingspan: Standard Wing: 90 in (2285 mm) Clipped Wing: 83 in (2110 mm)
Wing Area: Standard Wing: 1123 in² (72.4 dm²) Clipped Wing: 1037 in² (66.9 dm²)
Weight: 9.5-12 lb (4310-5440 g)
Length: 56.5 in (1435 mm)
Requires: 2-stroke .60-.90 cu in or 4-stroke .70-.91 cu in; 4-channel radio w/5 servos;
Bengt and Elna