Blev, don't worry my man, you're running a great campaign! 66% in a week is fantastic... and statistically speaking, it's extremely likely that you're going to fund.
It's normal for campaigns to taper off after the first few days. Just look at any campaign on Kicktraq.
They typically get the vast majority of sales right at the beginning, and right at the end, so honestly, I wouldn't worry about it, you're doing well. Just keep promoting it as best you can, keep your crowd updated, and you should be good to go.
Best of luck, and congrats,
-Cam