So, I've done a fair bit of searching these forums and trying to soak up various bits of wisdom. Despite all that, I simply cannot get decent ground interdiction results.
From what I've read -- FBs are your best interdiction aircraft. Particularly when outfitted with rockets. So, your Thunderbolts and Typhoons should be your best options.
My own experience suggests this is certainly true. 2E and 4E bombers are generally pretty rubbish at interdiction, completely wasted in the role (though this is *not* the case when it comes to Railway or Naval interdiction -- just talking ground-unit interdiction here).
Here's what I do: I set Recon to Interdiction "High" -- often Days 1,2,3,_,5,_,7. Priority "High." Use 1 Recon AC per sortie, flying as many sorties over the course of the week as I can.
Set FBs to Interdiction = High, usually Days: _,2,3,4,5,6,7. Priority "Normal." Altitude = 15,000. Highly concentrated strikes -- maybe 6-10 hexes, max. Usually try to get in 2 strikes per Hex per day. So, talking upwards of 1,000 FBs for these kinds of interdiction Air Directives.
Generally, I get 3-4 interdiction/Hex at best. My FBs get completely chewed up by AA. They take a huge beating. And for what appears to be very little benefit.
I've tried many different combinations -- and this is the best results I can get. And it just does not seem worth the price I'm paying in terms of lost FBs.
Suggestions for better Interdiction results very much appreciated!