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I know it's a little awkward to say this but is having larger breasts a disadvantage to a female vaulter?

At times my legs and body cleared the bar, only to be knocked down by my chests. Anybody experiences the same thing often?

Wear an extra sports bra and try to stay as fit as possible. Most females with large breasts will tend to carry body fat in that area so improving fitness mitigates the problem. Otherwise, it is what it is. There have been many very good vaulters with large breasts. It needn't be a deal breaker.