Quoted from jonnyo:Never shoot the center or side targets except during a multi.
Exactly right. Hitting them intentionally is just asking for trouble.
Also, as others have suggested, if it is kicking your ass too hard, put on the regular sized flippers if you haven't already.
It is a good sign that it keeps you coming back for more. But if you aren't having at least 1 really good game once in awhile, it will become tiresome and frustrating very quickly.