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Best practice for adding disks to aggregate?

Hardware

FAS3240HA

One node is using just SAS disks, other node is strictly SATA disks. DS4243 disk shelves.

The node running the SAS disks (4) DS4243 shelves has been running the disks at 80-90% busy for the past 3 months and we've been dealing with performance issues. We just purchased a 5th DS4243 shelf and added it to the aggregate today. RAID group size it as 23.

The way I understand how NetApp works all writes now will automatically be flushed to the new disks until they fill up equally to the level of the entire aggregate then writes will stripe across all disks. -> Is this correct?

But my main question is what would be the best thing to do at this point to maximize the new disks and help to reduce the busyness of the other disks in the aggregate?

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