As Eilatan said, if you think it will work, it probably will. Everyone has their own mantras that seem to work best for them 
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BenDrummin58 wrote a post a while ago that discusses wording to get the meaning across to your subconscious: Forming a Relationship with your Subconscious (there is a follow-up thread linked from there as well).
It may be worth trying out a mantra in the style described there if your current ones don’t seem to work; if nothing else it may give you some ideas. Good Luck!