As we all know HARMS is a unique t3 torpedo system. And it is imba.
It costs x3 less (only 3k mass + very little build time) than a t3 battleship and even 1 such unit can hold back the entire enemy navy. You only need t3 ACU or SAKU to safely build HARMS and t3 aa (which are 2 times cheaper than cruisers and will not let you kill HARMS or builder with torpedoes)
I suggest 2 ways to make it less imba.
- Make it 1.5x more expensive, increase build time
- Make it a surface system like other torpedo systems on t1 and t2 stage