I did read your post on removing BA was interesting but untried by me.
A substance boiling point is not determined by temperature, but by vapor pressure. Once the substances vapor pressure is greater than atmostpheric pressure, it will begin to boil. The temperature is just based on what usually happens here on earth at 1 atm.
Think about water. Its 212. Sit a glass of water out for a week and come back. What happens, there is less water isnt there. Its because boiling isnt determined by temp, but pressure.
So by that, there is a chance some BA may evaopatorate from fluxations and partial pressures, but its not going to be much at all.
If you want to lower BA do this.
Inject a small amount (5-10ml per 100ml maybe) or sterile water into your oil solution. Swirl it around really well (but dont shake). Then let it sit untill the layers have near completely settled. Remove the water now.
Because BA is also soluable in water but oil and test are very low soluable in water, some of the water will contain some of your BA. Repeat this until you get it where you want but beware...if you take out too much BA, your solution may crash. It could be a good idea to have some extra BA or other solvent on hand if you take it too far.