I am confused as how you are comparing Olaplex to Silk Lift. Olaplex is not a bleach, Silk Lift is a bleach. Olaplex rebuilds broken bonds during the lightening process, Silk Lift breaks bonds during the lightening process. If you do not wish to bump up your developer that is perfectly okay, just cut your amount of Olaplex in half. Also, if your client's hair is prone to becoming too soft afterwards, try using diluted No.1 in place of No.2 after you rinse your bleach. This way you won't have the cream-based ingredients making the hair quite as soft. Olaplex is an entirely customizable product.