It really is a few grams here, a few grams there. which add to a heavier weight. Experience helps bringing weight down :-)
Light balsa reduces the weight of the basic wooden model around 1/3. The complete model can be built with light wood glue. Heavy epoxy is only needed if glass fibre is used to strengthen the wing joiners. There are lighter options than epoxy to make the motor compartment fuel save.
Where have you placed servos and receiver? What kind of servo linkage did you use for elevator?
For my .15 version of the Typhoon I had put a small 4x 350 mAh NiCd in the cooler below the motor.
As I said before, it will fly fine with that weight.
But don't make the first flights with a tail heavy center of gravity. Tail heavy helps for tight turns and low landing speed, but you should make only small changes to the center of gravity.
Timo