Hi Mel
It would probably be too late for any alterations to your cure as by now the salt level in the meat will almost certainly be over2%.
As I said before you can leave it for a total of 10 days and you will be exactly where the recipe intended.
As you know I wouldnt proceed but Its really up to you.As you say It seems to have worked for some people.
without the cure you wont achieve that pink colour that is the norm with corned beef.
Sorry I couldnt be of more help but if you are going to have another go I would have some suggestions for you.
Jim