"Sending in batches of 10 emails" msg when batch processing disabled

Hello.

To stay within Bluehost’s 150 per hour limit, I’m using these settings to limit my emails to 144 per hour:

define(‘MAILQUEUE_BATCH_SIZE’, 0);

define(‘MAILQUEUE_BATCH_PERIOD’, 3600);

define(‘MAILQUEUE_THROTTLE’, 25);

On my process queue page (screenshot link below) I’m getting this message: “Sending in batches of 10 emails”.

Is there some code I might be missing which is causing it to default to batches of 10 emails?

Thank you for the help.

Matthew