as I understand you, you can add aditional hardpoints for every defense grid level, but not alter previous hardpoints. Correct?
Can you define how many "guns" a hardpoint has? Maybe you can finetune the firepower this way.
E.g. make more hardpoints with few spaces each for each defense increment.
Right now I made planetary defenses look like more of a battlecruiser: 2 x6 light weapons slots, 2 x6 Planetary slots, 1 system 44 and 1 system 22 slot, 2 x6 missiles and 2 x6 Berths. and changed Planetary hardpoints to mount only Heavy, Seige and missiles. Also added LR Mods for ALL heavy weapons (beams included). A bit of testing and will update the release.
Ps. Every new layer of defence (2nd and 3d) will have the same hardpoints + 1(+2) extra x6 Planetary slot.