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Im curious, but I dont remember seeing a PRV on any of the german stills that are kicking around. A vacuum breaker yes, and PRV on the steam jacket yes. Anyone out there own a Holstein or Carl who could correct me?

Also if you are in California, it is currently illegal to make cocktails of any kind at a dsp. (even to add ice to your product) and its a grey area to "give them [people] a bottle of booze" in part payment. Be very careful advertising this and how. MUCH much easier to 1099 them all and make them employees for the day and pay them min wage. Make sure your insurance covers this and that you wont get sued for a sprained ankle.

Are you macerating botanicals? or doing vapor extraction? or both? or compounding your gin? Each botanical does indeed increase proportionally to an increase in base spirit, but also in relation to time (how long the distillation run is), because how long a botanical is being heated/macerated/extracted etc will lead to how much flavor you get from it and what different flavors you achieve - its not just a question of amount (mass or volume). e.g. if you double the base amount (mass or volume) you may double the juniper to get the correct result, but may only increase the rose by 30%. You may have to use 300% lavender. The only way to know for sure is to use the full size still you intend to use, with a full size charge over and over till you achieve what you are aiming for. Sorry cannot be more helpful - scaling up for Gin is not the same as scaling up for non-botanical distillates.