i think it won't work making humans overpowered with your blood while they can walk during the day is so OP
The creation of a ghoul/thrall/blood slave in at least one of the sources that this author is drawing some inspiration from are indeed just this. They are at a minimum twice as strong as the average human, do not age, are addicted to the blood, will learn other powers that their master has over time, and once they age enough, if they lose all the vampire blood in them, they will age to their correct age in a short time. So for instance a human thrall that is 200 years old becomes dust in a matter of hours or even minutes if they run out of blood. Never mind that they will also be nearly insane by that point due to their addiction to the vampire blood, which is stronger than any drug out there.
There are plenty of drawbacks to being a thrall or a ghoul. Most are social in the early going, but sanity, normality, humanity, all suffer the longer that you are alive with this addiction. Yes you will be vastly more powerful than any normal human, and young and inexperienced vampires had best be careful, but there is quite the price to pay.
I recommend you read "Ghoul- Fatal Addiction" from White Wolf publishing to get an idea of what ghouls/thralls can be like.
Peace