Okay, so people reality check. What made them reality check is the real question you should make BluePhoenix.
Reality checks are the 2nd part of a "epiphany" that occur to the individual when he's dreaming. This can happen in a mechanical way "must do a reality check" or through a suspicious moment or "spike" of awareness "hm, wonder if I'm dreaming".

Do not worry about which reality check you do. Yes, there are some that are better than the others because their "power" lies on your ability to recall to do them. As melanieb said above, she uses reality checks related to things/events common in her dreams. This actually empowers the action a lot, because she's using association (which is one of the most efficient way to create a mnemonic, aka an aid to remember something).

So maybe you're not falling because you're choosing the wrong reality checks. Don't focus on them (you can also do a different one each time) because it's not the action who counts, it's the intention of recognizing (and making sure!) that you're dreaming. If you happen to do 500 Rc's a day just because your alarm says so, you're probably doing it in a mechanical way. Stop 1 minute and see your surroundings, try to detect something wrong about the scenario.

Remember that reality checks are the way to, not the end of