I recommend Fing'rs Brush-On Nail Glue. This is what I use to fix my talons whenever one breaks. This is pretty hardcore glue, so DON'T SPILL ANY. It dries almost instantly & will bond just about anything except certain plastics. Whatever it won't work on, it melts out of spite. It'll also kill your family if you look at it the wrong way.
Unfortunately, the pad is just going to continue to break off and you may break the sensor unless you and family learn to hit it more softly
Pounding on them just slows you down anyhow and makes you play worse. One approach might be to think of your drumming not as pounding but as a controlled dropping motion followed immediately by a controlled lifting motion. Not sure if that makes sense to you or not (guitarist here trying to sound as if I know something about drums).
I'll tell you what, don't ever buy the Guitar Hero drum sets under any circumstances as you have the same pad breaking tendencies not to mention cymbals breaking off.