All that hardened shields talks reminded me of shield mechanics presented in other games. Like Freelancer or Star Conflict, there type of shields determine that sort of damage it can absorb. Graviton, positron, molecular shield are a bit outdated terminology of shield type and do not suitable for starsector, but the mechanic itself (-% damage from HE type and from recent update solar shielding too -% energy) are already present. So if the main problem of hardened shield being auto s-modded because it's too much value for the cost, why not to divide hardened shields into multiple shield-mods: 25 vs HE, 25 vs Energy, 25 vs kinetic. For a frigate hardened shield is 8 OP and this shield mods should cost around 3 OP. Obviously high-tech and some mid/low tech frigates will try to take them all, but other low-tech ships will take only HE variation of such mod because they rely on shields mostly for evading this type of damage, while high tech ships tries to evade any damage. That way you can not only adjust frigates/larger ships balance, but high tech/low tech as well.