wierd - incentrator better than WMG???

[Taera]

I've noticed something interesting during my Last game.
I'm playing a SP game and i one of the AI races are the Drueshocka. I have a scout with scanners running through their systems and i've found designs of some of their dreadnoughts. One of these is armed with WMG3 and another with Incentrator3. The WMG one has more shields.
I've run a test - it appears that Incentrator ship beats the WMG ship with only the shields down, and this is given WMG has more (by 500) shields. Hows that? i thought that its a given fact that incentrators suck, especially compared to their 'bigger brother'.