You may have to adjust your engine choice to match the weight and flying style that you ended up with, including the battery, and if necessary, the ESC and motor. There is a general formula for watts per pound for various styles of flying.

A rule of thumb is that a sport-type, advanced aerobatic trainer needs about 50 watts per pound and that 10-20 watts per pound is about right for intermediate arf electric rc airplanes. With rc electric aircraft better performance comes with more battery capacity, less weight, and more efficient motors.

It may fly the way it is now, but if it is heavier than planned, it may be sluggish, or consume your battery power very quickly. Do the math and see how it works out for your setup. If it is ok, then go fly it!!

CGr.