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Moving review from one agency to another, worked for our distillery in a dif way. State Dept of Health got interested in our water usage as hazmat and sent our permit request to the State EPA. State EPA reviewed our processes and commended us on our "Green" stance. We reuse all cooling water indefinitely, we use hot stillage for next mashing while it's hot (saving water and energy), separating solids for animal feed and compost... EPA was happy, recused itself and we had permit in a week.

What is too high? 5%? 10? 15%? We are in a hit humid environment and routinely hit 12-17% loss. Idk about linseed but parafin works pretty good. Without further data I'd have to venture it's better and easier to change your barreling environment than the barrels themselves.

Davis Valley Winery and Distillery. Call Rusty Cox at 757-593-1055. The original number was wrong so I replaced it with the correct number.

Talk with @Mead he may be able to help ya out.

i may be totally wrong but is the angel share not made up of higher more volatile ,sharper tasting alcohols thus giving the aged spirit a smoother more palatable spirit . personally if i was seeing a very high rate of angel share i would first look closely at my cuts . as far as linseed oil is concerned i would look at barrel wax to seal a barrel before a oil product that may soak thru into me spirit . in my mind removing the angel share is the only real scientific reason for ageing in a barrel compared to ageing in a stainless vessel with oak chips , but this is only my opinion please dont send the coopers union to break my legs for mentioning oak chips lol ... and speaking of coopers you may be suffering from jus poorly made barrels made out of poor choice of wood grain . we had purchased some used wine barrels half of them had the usual stains and scaring the others were totally red from the wine inside soaking thru . i figured one was used for different wines but at a closer look both had identical info on them from the winery, however they were made by different cooperage's so my conclusion is they were made out of different quality of oak . allowing for different amounts of the red wine to soak thru ... that my guess , but there some very talented coopers on this forum that hopefully chime in and set me thinking straight ...