Does random reward evoke stronger habits?

http://​​measureofdoubt.com/​​2011/​​04/​​12/​​pulling-levers-killing-monsters-the-lure-of-unpredictable-rewards/​​ (how do I put a link like this in a word with blue letters?)

I’ve read that unpredictable rewards associated with a behavior actually encourage that behavior more effectively than consistent rewards.

The optimal habit-forming figure given in the link above is a 25% chance of reward for each instance of performing the behavior.

My hypothesis then, is that if I want to establish a habit by rewarding myself upon successfully performing a certain task, I should reward myself only 25% of the time if I want to ingrain the habit as forcefully as possible into my unconscious.

Anyone else think so, or have any other research to add?