Hi,
Assuming you have completed your skills assessment why wouldn't you be able to get points for your skills? Or are talking about work experience points?
If there is any doubt about the validity of what was included in the EOI, or if there is a doubt that you can prove what was in the EOI when it was posted, I would withdraw it and start again with the correct information. Its a lot of money to waste on mistakes and even if you take sponsorship from Victoria, if it is found that you incorrectly claimed points in your EOI and you're found to have 5 less (even if its still above threshold) the visa will likely be refused.
For additional points have you included IELTS, taking the test to get superior English is often a good way to boost points.
I hope this helps, I'm only speaking from experience and what I've read on these boards so I am in no way qualified but thought I'd put in my 2 cents worth.