Remove the "Air" from Air sweepers
Just a thought. How about making the air sweepers sweep ground troops too.
The heavier the troop, the less effective the sweeper is. Also limit its ground range compared to its air range. Just shy of the bowlers range 😉.
For farming it could be used to keep troops away from your storages and in war, away from your TH.
Because Bowlers are carrying a heavy weight with the boulder, make them immune to the sweeper(and buff the HP) like the Pekka is to spring traps.
This would make the bowler a useful troop and the effects of the sweeper could be counteracted with a well placed haste spell.