Water cannon Range modifier

The crit formula is Max * Crit modifier + Damage. The crit damage is correct by your values. Your tests indicate an increase in damage according at point blank. Unfortunately, it doesn't give us a solid number due to the low values and game rounding.

The predicted crit values are 23.1 + (7~22) = 30.1~44.1

This is 1 higher than it should be (Due to defence) which may be caused by decimals.

Min Value is 9.45 + (3~9) = 12~18

This is indeed lower than it should be and will require more samples at different damage ranges to evaluate.

Possible multiplier range: 1.296~1.35. If you have a character with a high water cannon rank, we can pin down the exact multiplier.