I've run KO metal geared servos in my Cat since day 1. Not had any problems, but as you say, on a super bumpy 8th track, maybe it is too much.
The reason you were ok with xx4 is probably the nature of the steering system. The Losi one has much more natural flex in it (plastic bell cranks and long link), which would flex in an extreme issue, where as the steering on the car is much stiffer - alloy arms and short link.
Because I haven't run one, I don't have any suggestions for a servo saver i'm afraid.
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Matthew White
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