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...so maybe you're already doing this.
As a long time nurse, I found using your middle finger (the FU finger) rather than your index finger was more effective That finger seems to be stronger and the angle between it and your thumb makes for a more forceful flick, so you won't have to flick the syringe so many times.
You can practice flicking with an empty syringe to see if you feel a difference between the index and middle finger methods.
It will soon become second nature. Hang in there - you can do it! 
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