Hi Chris,
Thank you for your interest in Syncfusion products.
I am afraid that I am unable to reproduce the issue. When I tried to add the new row with IsCopyFormat set to true, its adding new row with last row format.
Please refers to the below sample:
http://www.syncfusion.com/uploads/redirect.aspx?file=Table Row insert_aac8ef9c.zip&team=support
Please have a look into the sample and could you please modify the sample to reproduce the issue and also please provide your Office version and Essential studio version? This will helps to investigate the issue further.
Best Regards,
Bhuvana