I'm assuming you're talking about pusher planes, since tractors have two different elevator control boxes, one for each side. For pushers, I'm not sure. Technically, there's only one elevator box for both sides, so it feels like both sides should lose 1 G when it takes a hit. On the other hand, that seems a bit steep. The issue hasn't come up yet in my games, but what I'd recommend is that you divide the elevator box in half down the middle, one for each side.
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