My thought on using air to counter Anti air is that even the most powerful air units are poorly suited to eliminating SAMs. I am completely ok with that. I think ground should be the counter to anti air. There is no long range Anti-Anti AIR A<>G unit like the HARM missile IRL. But there are effective counters, any land unit can do the job given protection, and where you can't get land units, for the most part you can setup TMLs fast enough to slap down Anti air an allow a significant strike.
The only reason I mention the A<>A capability of the restorers is that they are a pretty effective counter against ASFs in your mod, you should play a round with them and see just how effective they are. The MAA/transports we talked about used in conjunction with restorers would eliminate ASF supremacy so if we do make MAA shooting transports, then and only then we should probably work to nerf the Restorer A<>A capability.