I think I have an idea why your Hogosha fighter is getting technerfed more than your Rheinlandic bomber. It all has to do with guns. The technerf works on a mutiplyer, in that the more forgien equiptment you have on the ship, the more your powercore is reduced. Because the bomber turrets are Civilian guns, the bomber has less forgien tech attached to it. That might be the cause.
Then again, it seems like you've done some experiments that throw this theory out the window, in which case, I honestly don't know why some ships get more of a technerf on certain IDs than others. I'm afraid you're going to have to ask an admin on that one.