'additional boost' is correct and usable in written English.
You can use it when you want to describe something that will give an extra advantage or benefit. For example: "This new program will give my business an additional boost".
It then offers an additional boost when necessary.
Historically low mortgage rates have given an additional boost to prices.
There may be additional "Boost" events throughout the year, so keep an eye out.
However, actually winning the caucuses probably provides a candidate with some additional boost.
His statement today lends an additional boost to the sentiments of others, including Senator Clinton and Mr. Nelson's partner-state-in-crime, Michigan, who want their voters counted.
Now the show has added a familiar star, John Stamos, as a cast regular, which Mr. Reilly said was expected to give the show an additional boost.
But the Globes ratings were probably given an additional boost by buzz about Oscar nominations, which were announced just a few days earlier.
Community engagement received an additional boost after Ms. Fogarty was hired away from the Bay Area Discovery Museum, a children's museum she was running in Sausalito, in 2006.
That number was likely to climb as drivers were given an additional boost of roughly 40 horsepower in this weekend's qualifying.
So what this package does is provide an additional boost that is substantially more significant than I think most economic forecasters had expected.
Thanks to Trump and the Republicans, the Fed now faces another challenge, in the form of an additional boost to the economy provided by a front-loaded tax cut.
