So I may or may not hate myself for posting this, because it's a great strategy in our current game and it may be unintended.
Lately when we've been attacking AI planets, to avoid a lot of pain we've been sending all 5 of the Mark 3 Forcefields I have researched into the breech right before our fleets. Even though we take a pretty nasty hit to damage under the forcefields, we frankly aren't losing any troops and it gets all the AI really mad enough to come fight so that after a few sorties back to our own planet for mobile repair goodness (and repairing of forcefields), the majority of enemy forces are pretty much done for. We constantly move our fleets on top of the wormhole to keep them from expanding, then retreat them before the five forcefields wear down enough to get the fleet unprotected.
It's double good because my Spire Maws will eat enemy ships through the force fields, at which point I make off with them into our own planet.
Is this kind of behavior intended? It is a lot slower, but the Maws thing almost feels like cheating (although, to be fair, their Starship Deconstruction Guardians made off with a few of my starships from outside the forcefield by picking up my 'protected' Starships inside before I noticed this too.)