It would seem unlikely that your template change accounted for such an increase in bounce rate in one channel if all the other channels showed a drop. I had a similar issue recently and my figures just were not making sense and then noticed that my analytics was being spammed. You can set up filters so that you get a more accurate reading and it is worth taking the time out to set them up. I've only got my head around it so would do it an injustice if I tried to explain it here but just search for "filtering out spam in google analytics" and you will find the information you need.
of course if you are seeing increased traffic in one channel then that will more likely have a higher bounce rate - 35% of 2,000 visitors is better than 25% of 1,000. But a difference of 30% in a short period of time looks more likely to be some other issue than a true reflection of your sites activity.
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