The phrase 'immensely more' is correct and can be used in written English, typically when comparing something to another.
For example, "I like the new car immensely more than I did the old one".
Bonner was an immensely more emotional person.
That's immensely more fulfilling than what profit your company made".
Finding someone immensely more popular as your backup can in no way disrupt your team.
But the struggle, which remains unfinished, is immensely more diverse and complicated than the schoolbook version.
Staring right into the present is immensely more shocking than gazing at some corny crystal ball.
But he remains immensely more accountable to it than does say, the White House physician.
"Our loss would have been immensely more difficult without their support," he said.
It is immensely more popular, it attracts different social groups – and it requires less land.
"Bahlamms Fest," a suite from a 1999 opera by Olga Neuwirth, was immensely more inviting.
For another, the circumstances surrounding her defeat are immensely more disturbing.
In the meantime, however, he had drafted a document immensely more radical than anything Congress had considered.
