3A average per flight? You've got a real problem if that's really the case! You shouldn't be exceeding 1Ah average for the entire flight (assumed a 15 minute, energetic 3D flight). This, based on actual readings from flying a 40% Carden Extra with 8 digitals (600 mAh avg) and extrapolating to your 11 servo setup. Better check for some serious binding or mis-adjustment in yout servo centering/endpoint/tracking linearity with any ganged servos.