"which at best" is a correct and usable phrase in written English.
It is typically used to introduce a limitation or drawback to a statement. For example: - "I wouldn't recommend that restaurant, which at best serves mediocre food." - "The movie, which at best was only mildly entertaining, received mixed reviews from critics." - "I can try to fix the issue, but it's a difficult problem to solve, which at best will take a few days."
White House officials said they deliberately left that question unanswered, which at best is an abdication of responsibility.
Since then, he has been on and off unemployment benefits, which, at best, provide $100 a week.
These same features also render it impossible to assess the failure strength of the disc from isolated tissue samples, which at best can only yield material properties.
This is a great improvement over what the camera alone can do, which at best is 100ms, but was shown to be as high as 200ms.
Various 'service load damage models' were proposed in the 1970s which at best successfully augmented extensive testing under simulated service load conditions.
"I find a number of assertions, which, at best, demand careful analysis and, at worst, do not deserve any analysis," Mr. Armstrong said.
Many conventional light displays use some form of preprogrammed control box, which at best enables the user only to vary the animation's speed.
The funds invest in companies which, at best, have a positive impact on society and the environment, and at worst are broadly neutral.
This is in comparison to the use of existing reference data (e.g., field or airphoto data), which, at best, exist for only parts of the area of interest, for only specific time periods, or are restricted thematically.
Texans need to learn to value water properly, Mr. Rainwater said, and that may mean building new water-supply projects and easing up on lawns in West Texas, which at best receives half the rainfall of East Texas.
Bring Cyprus and Turkey in, and the island's squabbles would be "history" within 20 years, thinks Mesut Yilmaz, the party's leader, cheerily ignoring the several years which, at best, will lie between the two arrivals.
