This is a huge nerf, across the board. Here is why:
If you leave your citadel fit anti-subcap, and they drop as little as a single carrier or dread on it during its vuln window to damage it, its anti-subcap fit is locked in for all 3 timers. You cannot refit to counter caps? So hostiles just bring captials on all 3 timers and easily kill your structure.
If you leave your citadel fit anti-cap, then hostiles just drop a sub-cap fleet on it during its vuln, damage it and its fit is locked in for all 3 timers.
Up until now, because the anti-subcap modules were so useless, mostly everyone (who was smart) choose to leave their citadels anti-cap fit and would just deal with sub-cap fleets on their cits with counter sub-cap fleets. If hostiles tried to escalate, then the citadel could help defend against the caps b/c it was anti-cap fit.
You want to nerf void bombs? Great.
Your counter-weight to this nerf is to simply buff the subcap missiles? This is an ineffective change.
Do not prevent citadel fits from being changed while they are reinforced or repairing. Allow us to swap between cap or subcap launchers as we choose and maybe we can actually put your new sub-cap missiles to use and not have to rely on bombs.
As of right now, you can’t react to a reinforcment and you can’t change your strategy on the second and third reinforcment. Citadel fits can be ship scanned during a vuln period. People just scout them the week before, scan them, see what their fit is…wait a week and counter with the opposite.
Until this fundamental gameplay mechanic is fixed, NOTHING YOU DO to change sub-cap missiles or modules will have any effect.