Oh I'm doing that, but they always seem to sneak from another planet not currently on my control from that next system. hehehe

Personally, I generally just stick a couple of carrier squadrons (with a sova "flagship" on my star and call it controlled. Drop some Kodiaks at the inbound entry point (supported by some flak, robotics, and command cruisers) and the enemy really gets the point. And its also a great way to train any capships you happen to construct -- if you have marauders on, the carriers are constantly killing stuff, so the enemy is gonna get hurt, constantly, which means nice XP for you. Just remember to set the "WP guard" groups and the "carrier guard" sovas (and any support ships you give the sova) to "local area" so they don't hare off all over the place... and end up out of place just when you need them in place

How did you know I wasn't wearing any?