If you really want to spice up combat with mines, what about a new 'stealth' secondary effect that makes mines invisible on scanners (possibly untargetable to PDs)? I suspect it would be quite surprising the first few times a player runs into them (both figuratively and literally).
As for balancing, stealth cascade/ion disruptor/FSD reboot mines would be a bit much imo, but you wouldn't have to worry about these ridiculous uses since you could only get stealth mines, cascade mines, ion disruptor mines, or FSD reboot mines as the required secondary effects are not stackable.
Now that I think about it, torpedoes could potentially get a 'stealth' secondary effect as well. Again, it wouldn't be stackable with cascade, so they would be more of an opportunistic high explosive surprise than an effective shield killer