Load rating is fine these have an XL load rating, which is designed for heavier vehicles (these Blizzaks come as an XL standard). Car has exhibited no weird behavior with all of the error messages. Leads me to think the DSC module is at fault.
@gareth - what's the mechatronic unit?
Car is going in for service Monday afternoon, should know something by Tuesday/Wednesday. Will keep all of you posted. If anyone has suggestions, please continue to write them here. Thanks!