The phrase "although only slightly" is correct and usable in written English.
It can be used to indicate a minor degree of something, often in contrast to a more significant expectation or outcome.
Example: "The project was successful, although only slightly, as we faced numerous challenges along the way."
Alternatives: "even if just a little" or "albeit to a small extent".
After these revelations, the tone of media coverage changed again, although only slightly.
Next, refined results that hold for C≫1 are given, which indicate that the boundary is not convex, although only slightly so.
But Steuben, Chemung and Sullivan Counties are among several in New York still below their normal rainfall for the past month, although only slightly.
The Fourth Circuit held that while there is "common-sense appeal of the plaintiffs' position", the government's argument is "the stronger position, although only slightly".
FOR Day 2 of a weekend hiking trip, the Capitol Ditch Trail is even more resplendent, although only slightly more ambitious: a six-mile round-trip trek toward the foot of Capitol Peak, a 14,130-foot gray granite monolith.
Although only slightly more than 10 feet (3 metres) long and about 5 feet (1.5 metres) wide, the highly touted "People's Car" could seat up to five adults and, in Tata's words, would provide a "safe, affordable, all-weather form of transport" to millions of middle- and lower-income consumers both in India and abroad.
Ambient heat losses may substantially decrease the steady-state conversions obtained in a converter, although they only slightly retard the light-off process.
These points were easily recognizable as the deteriorated strongly from the general trend of voltage decrease below the 3 V stated above, however it is likely that the other points are also biased through this effect, although probably only slightly.
For the actual HRMA, the focal point and the aimpoint are not the same, although they differ only slightly.
Although it reported only slightly better-than-expected earnings on Monday, there is some optimism that the company's performance will improve later this year.
Young people are also more likely to be politically liberal, although they're only slightly more likely to be supportive of gun-control measures.
