"still maintaining" is correct and usable in written English.
You would use this phrase to express that something is continuing. For example, "The team is still maintaining a lead in the race."
Still, maintaining that pace will be difficult.
But he is still maintaining his innocence.
Longform and abstract while still maintaining a steady techno framework.
But they are still maintaining a healthy skepticism.
OMC carbons can provide much higher power density while still maintaining good energy density.
Parliament thinks well, we are still maintaining our sovereignty so our point stands firm.
How can he address the needs of his company while still maintaining strong family relationships?
This allows us to capture non-decomposable aspects of the data while still maintaining tractability.
In 2015, JA realigned with TTP, while still maintaining autonomy to launch and claim attacks.
"What Huckabee seems to be doing is still maintaining that specific appeal.
Finally, will NGOs be able to create an enabling environment while still maintaining a watchful eye?
