Rather than increase the buffer size you can scale the number of Dopplers available. Below is a link to a guide to how many Dopplers and Traffic Controllers to plan for.
https://discuss.pivotal.io/hc/en-us/articles/225564028-How-to-Calculate-the-Loggregators-Message-Throughput,Rather than scaling the buffer size the approach we recommend is scaling the number of dopplers. See https://discuss.pivotal.io/hc/en-us/articles/225564028-How-to-Calculate-the-Loggregators-Message-Throughput for a guide to scaling more dopplers (and possibly Traffic Controllers) as well.
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