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I totally agree with using very large test beds (lately ~100 bots for me), but I think you're wasting some CPU cycles testing against bots that are unlikely to be affected by your changes. Bots you get 98+ against probably won't be affected unless you're testing changes to your core surfing algorithm or something. Most changes to surf stats are not going to affect HOT bots at all, and flattener tweaks won't affect any bots that have no chance of triggering your flattener.