"slightly reducing" is correct and usable in written English.
You can use it to describe something that is being reduced in a noticeable but minor way. For example: The company's profits have been slightly reducing in recent months.
Yale is slightly reducing that stake to 23percentt, from 25percentt, according to Mr. Swensen.
But really, this proposal isn't about preventing kids from seeing porn, it's about slightly reducing the likelihood that they will.
America's trade deficit fell to $33.4 billion in February, slightly reducing the deficit for the latest 12 months.
It will also increase the efficiency of coal-fired plants by slightly reducing the quantity of coal needed.
On the West Coast, the Pacific plate is sliding under the North American plate, pushing it up slightly, reducing the relative sea level rise somewhat.
Then, informed that we can actually control costs pretty well, while maintaining a universal guarantee, by slightly reducing choice and convenience, you declare this an unconscionable horror.
Ronald Reagan's 1987 budget, which raised taxes after many earlier protestations that tax increases were not forthcoming while at the same time slightly reducing military spending.
It will provide coverage to tens of millions of uninsured Americans, prevent the worst insurance company abuses, and begin to wrestle with relentlessly rising costs — while slightly reducing future deficits.
It won't surprise you to learn that I think that "slightly reducing choice and convenience" might slightly understate the case, given what we know about how Medicaid generates its current savings.
After examining the different financial projections for various options in Consumer Reports (October 2000), I concluded that a better answer would be a combination of two moves: eliminating the earnings cap, now $80,400, and slightly reducing, by half a percentage point, the annual cost-of-living adjustments for benefits.
The likeliest outcome is that asset purchases will initially be tapered from $85bn a month to $75bn£55bnbn to £48bn), the equivalent of a doctor slightly reducing the dosage of a powerful drug in the hope that eventually the patient can be weaned off the medication altogether.
