Funny my Challenger has a big lunati solid cam and does not make a lot of vacuum.
Brakes have a great 1st stomp but seem to lack a very good vacuum.
My to do list includes putting my vacuum pump on the booster to make sure it's not bleeding down.
If it's not the booster, I'm thinking a milder cam might be a better solution. The engine is pretty much stock with the exception of a set of headers, and with 3.23 gears it's a dog off the line. Beside I'm not racing this car.