While i haven't engaged any enemies in my home systems since the big 2.0 changes, if it works the same way as it did before...
You might have to go into the shipbuilding section to fit some (or maybe even just one per sector/starbase), of your fortresses with snare modules to stop them ignoring your defenses...
Failing that, placing a couple of corvettes at "breadcrumb points" to try and tease the enemy closer to your stations, might work (never tried this myself, but it's worth a shot).
Something else that might also be a good idea, is placing corvette only fleets on patrol or at points around target sectors to chase down enemy fleets.
In particular, a big change in the recent big patch is how corvettes finally use their small size and speed to good effect, especially in sector, but also in hyperspace, to move considerably faster than other ship types or mixed fleets.