One thing to keep in mind about FAF in general is that large numbers of any unit perform horribly due to the pathfinding issues we have in game. The more shards we add into the navy the worse the navy as a whole will perform.
Frigates are a prime example of this, you can get 40 frigates for the price of one Summit or 30 for the price of one Neptune. It's a choice in favour of the frigates in most cases.
But 160 frigates vs 4 Summits and 120 frigates vs 3 Neptunes is a choice where almost always you will want the Summits or the Neptunes simply because you need to do 16 commands to get the frigates moving, while 1 command will work for the Summits and the Neptunes.
So if the increased micro for the torping side is an issue, the same can be said for the naval side. In this case I think the issue is worse for the naval side because of FAF pathfinding lag, while split attack is a fairly simple and robust procedure. If we do need to force more micro for one side, I'd rather it be on the torping side.
Preferable to both would be an increase in effectiveness vs planes though. This ofc is harder to achieve without ruining gunship vs shard balance but I think it's worth it to try out higher damage values. It is 80% of the cost of a T1 AA with 50% dps and 400% buildtime after all.
BTW. Nice work on the Sera AA fix, they seem to work quite nicely now