The phrase "while improved" is correct and can be used in written English.
It is typically used to indicate an improvement or change that has happened while something else simultaneously occurs. For example, "She has gained more confidence while improved communication skills have helped her excel in her job."
Thus, I expect the improved method will still be sensitive to priors, and the power, while improved, may still be low.
The Colts' defense, while improved, is still beatable.
Gate receipts, while improved, had not been what was hoped.
Overall, the balance of risks, while improved, remains on the downside.
And the sexual harassment policy, while improved, still makes it hard for somebody to get an investigation beyond Speaker Silver's reach.
"BHP Billiton's offers, while improved, still fail to recognize the underlying value of Rio Tinto's quality assets and prospects," Paul D. Skinner, Rio Tinto's chairman, said in a statement.
The Explorer, while improved in many ways over the models that received so much attention for tire failures and rollover deaths, has not exactly caused a stir in the automotive world.
Critics argue that, while improved housing conditions for workers is a positive development, the root of Saadiyat's more persistent labor problems — recruitment fees and requiring workers to cover relocation costs — remains unaddressed.
The open source evidence suggests that the drone targeting, while improved, is stuck in the middle of Al Qaeda's leadership lists and is not particularly increasing the likelihood that Bin Laden and Zawahiri will be located and killed.
While improved hard disks and memory chips are useful, researchers in spintronics are still searching for something that will propel the field forward the way the transistor transformed electronics.
