According to you on your authority.
many other non-RCs agree with this method
True. Does your doctrine derived by the same method agree with theirs? Is yours in agreement with Calvinists? On how many points? Or, contrarily, does yours agree with Arminianism? Does yours agree with the sola scriptura Baptist on paedobaptism or with the sola scriptura Lutherans?
Or is your sola scriptura doctrine uniquely your own?
Pro_4:2 For I give you good doctrine, forsake ye not my law (Torah).