How to destroy vault efficent?

I am playing on official PvP server and today I was trying to blow up vault. Lost 26 explosive jars and it cost me almost all day to farm them. The vault is more cheeper than 26 explosive jars FC and they didnt do what they should. Before I tryied to blow it up I did test in single game. It cost me 25 explosive jars for 4 times. 25 for 1 vault. So what I did wrong in PvP that it didnt blow vault ? Yes it was passed 17.00.

It takes 25-29 jars now, blow up sets of 5. Do not place on top. Place beside.

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