I'm surprised you didn't set the sector size to 8KB. That's the page size for SQL Server and would have been a better choice than 4KB.

On my production servers, I usually format those volumes not requiring compression (i.e. non-backup) that are used exclusively for SQL Server to 64KB. This keeps the MFT nice and small, ensures minimum fragmentation and fits well with SQL Server's extent size of 64KB: Allocating an extent maps directly to a disk sector.