Now I know your a troll. Flak does not need any more buffs, strikecraft are already useless in the current metagame.
Looking at your post history, I fail to see what you've added here or to the community. So far, for the past couple of months, all you've done is complain about the state of flak in the game.
Heavy cruisers are used in a variety of situations, but usually they are to brute force a high level marza or low level titan...most likely they will be built by a frontliner suddenly getting lots of feed or an eco player trying to fleet up and double on a large fleet...
If you go the route of HCs, you have a narrow window of opportunity to make use of them....the enemy will easily counter with bombers, hoshikos, and/or guardians, so whatever you plan to do with them you have to do fast...once titans get to higher levels and Advent/TEC SBs start getting their abilities, HCs are pretty much useless...
They serve a purpose and in certain situations can be the best option...not every game will see them though, and they usually depend on the element of surprise...
That's their weak point. They've got too many counters I'd say.
I think that yeah, adding some sort of flak ability to heavy cruisers to take out strike craft would be the best compromise.
They'd still have counters:
1. Most Titans have some anti-cruiser abilities
2. Repair cruisers and repair abilities in general
3. Certain capital ships would still be able to wear them down when supported
As it stands, they are really niche.