What's the key in not losing so much readiness when attacking?

attacking as demo.

also if you are doing gs, br or ab then don't send more than 1/3 of your troops etc.

same with ss/ps attacks.

So it's best to have more than 3x,s of the attacking unit than your target?

yes or just ramming target with 1/3 of your army (troops/jets/tanks) until you break thru.

Med tech helps also

Not for readiness loss it doesnt.

yeah mrford it does if you don't keep track of how many units you have left after a couple attacks and go above 1/3 without notice. But that is conditional so technically yeah it does nothing for readiness directly.