[Q]

I absolutely agree that it is not the ideal solution, but it was the best thing I could find without a change made by MM.
The best as I said would be a moddable percent of minesweeping failure (depending on the mine size/tech level), maybe combined with a moddable percent of hit failure of the mine itself. That would create a degree of uncertainty we both seem to like with mines.
On the other hand, if you can build many ships that cost about 50000 minerals each (that will be the cost of a minesweeper in my mod that can sweep 100 mines) don't you think that you have won the game already?