Mbachur the minhag of simonim on rosh hoshono has a very strong source. The gemora in mesechta krisus and in horiyos brings down “abaye who says, now that we know that simonim have a meaning, a person should always eat the head of a lamb etc.” all the simonim that we use now. So our rosh hashono simonim have a very clear source. and although today these are just about halocho, its clear from the gemoroh that abaye was just giving us a suggestion.
