Нашёл!
Одна аглицкая компания, которая делает свои бойлы на пару, подчеркивает, что для паровых бойлов требуется всего 1-3 мл аромы на кг, в то время как обычная дозировка для вареных бойлов лежит в диапазоне 10-16мл на кг. При этом достигается более точная концентрация аромы в разных партиях бойлов.

Текст оригинала

BOILIES vs STEAMED BAIT

Boiled baits, not surprisingly, undergo a boiling and battering process whereby there naturally will be a tremendous loss of flavour, nutrients and many soluble ingredients (at uncontrollable levels) paramount to the quality of that bait during the cooking process, subsequently, baits in some instances are over flavoured to begin with to allow for this loss, consistency levels are very hard to achieve.

Steaming on the other hand is a far more subtle and controlled form of cooking baits, the flavour loss is very minimal, and more proteins and nutrients are left within the bait, some are obviously lost due to the cooking process, but at a lower level, in fact so much so, that most of our baits have no more than 1-3ml of flavour inclusion per kilo, this means consistency in baits due to the low levels required, it also means you will never get an over flavoured bait, which can sometimes deter the fish.