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You should always put your official title on your resume. This is one of the things that an employer checks, so you may be immediately dismissed from the job screening process if your contrived job title doesn't match the title provided by your human resources department.
If you feel strongly that your official title doesn't accurately represent your duties then you may create a more appropriate title and put your official title in parentheses immediately adjacent to your self-proclaimed title.
Potential employers may raise their eyebrows at this though, and you could just as easily list all of your accomplishments within the scope of your current position and then list the additional project and goals you have attained.