Batfink, I don't think I got more cautious as the streak went on. I actually didn't realize there was a "streak" until I got to 60 kills, but that was all in one night, I just kept upping and flying around.
Mars, I don't fly the Spit 14 any more cautiously than I do any other plane, just try to avoid situations where I'm sure I'll be killed. I'll still engage any one plane I come across, or any number of planes if I've got E on them. It isn't like I'm running from fights, more like just avoiding the huge furballs that (almost invariably) involve all of one side dying.