I have managed to split a few with GWX3, mostly medium cargo's - and only with the magnetic exploding under their keel. Never seems to work with impacting the hull.
The 'lock' always goes to the center of the ship, which as stated above isn't the best spot to hit.
I go for engines, it's a no brainer - it's under the stack. Gauging where the fuel tanks are isn't as easy.
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