How Do You Defend Against

[Renegade]

How do you defend a planet from invasion in PBW?

Here is what I have noticed:
1. Even though my designs prove themselves in battle simulations, they are consistently defeated by ships that should not be able to do so. Not by numbers, or greater skill level as my Fleet and ship Skill level is 20% and my ships are Battleships armed with PPB V backed up by DUC IV's. They are equipped with combat sensors and PDC's as well as an EMC and a Multi Targeting component.

I have noticed that the AI always defaults to allow certain weapons that should not be able to destroy a well defended/shielded ship to do so with great easy in combat but not in simulated combat.

I have also noted that despite having multiple well designed weapon platforms, troops, deployed mines, and even deployed satellites do nothing to prevent planet capture.

Granted I am semi new to multi player and I do have a lot to learn. I maxed out Aggressiveness and defensiveness and then researched military science to max. I placed my fleets in orbit over a planet that has both ship and fleet training facilities and then let them train to max 20% before sending them out to fight. I have fleets of 100 ships, mostly BC and BB with some Destroyers and LC as support.

I also noted that no more than 5 mines took out one of my smaller fleets at a Warp Point. 5 small mines that is. WTF gives with that?

How do you defend against poorly equipped ships kicking the crap out of your well armored, defended, and skilled ships?