THE MINES!! To strong, good enough or to weak?

[Vomitus]

You can add a chance to trigger a mine by allies. Let say, 10-20%.
This chance also could be applied only when an enemy tank is in your sight of vision(or lower). Otherwise - no triggering occurs.

OR / AND

You can add a chance of critical failure. Let us say 5%. Or it could increase/decrease with skill level/mine cost.
Critical failure can act in two ways:
1. You can blow up yourself when setting the mine / you can break the mine when setting(skill is used, mana spent, cooldown activated, but mine did not lay).
2. Mine can misfire when triggered. Then no damage is done.

AND

I fully agree that mines should deal damage to allies when triggered. 50%.

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According to triggering mines by allies.
In ways of realism we can imagine some situations.
1. Minelayer is relaxed because no enemies are near. He is in fully concentrated on own mines and can safely ride by minefields carefully pass through mines.
2. A Minelayer is in hot battle around his minefield. One or a couple of enemies are near and they attacking. Concentrating mostly on enemies Minelayer pays much less attention to own mines and can make a mistake accidentally triggering own mine.
That's because we can add only a slight chance triggering own mine.

_Edit

About voting.
I voted for no change but it is wrong. Though, I don't think mines are too weak or too strong. It is just another strategy and the power of mines at this moment does not creates its' imbaness. Mines should be changed a bit but not nerfed or buffed. Changes have to be qualitative rather than quantitative.