"more heightened" is correct and usable in written English.
You can use it to describe a situation or emotion that has increased in intensity, such as "the suspense was more heightened as the detective closed in on the suspect".
And some of our emotions might be much more heightened than they are in real life.
Because of this, interest in the film's women was even more heightened.
It could be more heightened still, playing up the wired, sinister strangeness of the scenario.
She comes from a more heightened world, and I'm self-proclaimed basic".
Yes, ChildLine opened a special number for upset fans, but the outpouring for Malik appears to be much more heightened.
Like picadors taunting a wounded bull, we watched as all the Western silliness that we were already used to grew more heightened.
Upon her return, the odyssey continued, the search for meaning, for her place in the larger world, more heightened than before.
"Politics is the big swing factor here as any more heightened political uncertainty could easily put rate normalization impetus on ice," he said.
And it seems right and even dignified that this object of desire evoke a more heightened response, one out of favor with marketers of "aspirational" luxury.
It gets a bit more heightened when Yvonne takes over Mrs. Cleg and wears her clothes and takes on the domestic goddess role.
His films' potency derives less from complex narrative or propulsive editing than from his poetic images and psychological acuity, and his language is far more heightened and stageworthy than the naturalist, prosaic dialogue in most movies.
